anorthoclase thin section

html += '\n\n\n'; 4.5 x 4.4 x 2.0 cm. Some localities for well-characterized material include: on Pantelleria and Ustica Islands, Italy. August, 2000. ... perthite, anorthoclase) --Box 9. Original Rockhounds Discussion Group Using various methods of melt inclusion investigation, including electron and ion microprobe techniques, we estimated the composition, evolution, and formation conditions of melts producing the trachydacites and pantellerites of the Late Paleozoic bimodal volcanic association of Dzarta-Khuduk, Central Mongolia. Digitized 35 mm slide, with unpractised color and contrast correction. Picked up on the cone of Mount Franklin. var html = '\n\n'; The Open University's Virtual Microscope - The Virtual Microscope is a development project at The Open University between the Multimedia Enabling Technologies Group and the Department of Earth Sciences. One other K-spar to watch out for: Anorthoclase: Resembles microcline in thin section, but the tartan twinning is much finer and the 2V is smaller. The thin section shows a lot of feldspar with zonation and twinnings. B - Bonds On/Off Anorthoclase is the only alkali feldspar that is not K-feldspar. on the surface and in thin section. Feldspar - Feldspar - Identification of specific feldspars: Alkali feldspars can often be distinguished from plagioclase feldspars because most grains of the latter exhibit albite twinning (see above Crystal structure), which is manifested by parallel lines on certain cleavage surfaces, whereas grains of alkali feldspars do not. { Former John Sinkankas collection with Ward's Scientific label. ... Anorthoclase. Thin-sections are carefully prepared glass slides suitable for mineralogical and petrology studies when viewed through a microscope. Acquired from a blaster working there last summer. This view shows two large flakes of brownish green biotite and minor hornblende (darker smaller grains) near the left edge; the hornblende does not have a distinctive appearance. Anorthoclase megacryst in basalt. The thin section consists of 5-100/o phenocrysts in an unaltered glassy matrix. Originally, “plane polarized” scanning in separate E-W & N-S orientations was attempted to highlight pleochroic variation, but this ultimately had to be abandoned due to significant (and very unsightly!) Microcline is a regular and essential ingredient of sandstone, especially feldspar arenaceous rocks and feldspar graywacke (Sections 5.5.3.2 and 5.5.3.3 Section 5.5.3.2 Section 5.5.3.3). RRUFF Project Specimen ID: R060054 In transmitted light, thin sections reveal the texture and crystal shape of minerals and other identifying characteristics while through polarized light, the mineralogy is awash in color allowing for more complete mineral identification. Anorthoclase is the intermediary member of the Albite-Sanidine series.It is interesting to note that this mineral series contains two end members crystallizing in different crystal systems. printWin.document.open(); Adrienne McElwain Photo. Some rounding of the crystals occurred while still in the magma. A large anorthoclase that appears to be a Manebach twin. var gAutoPrint = true; // Flag for whether or not to automatically call the print function A 6.5x3.4x2 cm loose crystal of Anorthoclase with small Aegirine crystals from Mt. Composition of the Clinopyroxene crystals from Mt Erebus is given as En 57-58 Fs 15-16 Wo 17-18 in "CRYSTALLIZATION PROCESSES OF ANORTHOCLASE PHENOCRYSTS IN THE MOUNT EREBUS MAGMATIC SYSTEM: EVIDENCE FROM CRYSTAL COMPOSITION, CRYSTAL SIZE DISTRIBUTIONS, ... Anorthoclase crystal on augite crystal in cavity in basalt. Franklin Mineral Museum no. FOV is 3.50 mm x 2.50 mm These images were taken from the thin section being offered. Colorless, Green, Gray, Gray pink, Yellow. Part of an anorthoclase megacryst still embedded in scoria and showing obvious rounding from contact with the magma. Basalt quarry, Pauliberg, Kobersdorf, Oberpullendorf District, Burgenland, Austria. else We enable science by offering product choice, services, process excellence and our people make it happen. Moonstone) with a strong blue schiller from the Pili mine, Concho, Chihuahua, Mexico. . Well shaped crystals and twins are highly sought after by mineral collectors, and the Moonstone variety is used as a gemstone. Albite also forms a series with Sanidine, and the intermediary member of this series is Anorthoclase. The specimen shows a wonderful pearlescent shimmer and play of colors. Anorthoclase is a Na ... when present, make it look pseudohexagonal, and single twins. These were probably collected in the 1970s. Sanidine and anorthoclase are common constituents in extrusive igneous rocks such as rhyolites, where the rock cooled quickly. Unfortunately, these thin sections are thicker than the usual 30 micrometers, and in crossed polarizers (XPL) the plagioclase has colors of the upper first order, instead of the usual grey. Avantor ®, a Fortune 500 company, is a leading global provider of mission-critical products and services to customers in the biopharma, healthcare, education & government, and advanced technologies & applied materials industries.Our portfolio is used in virtually every stage of the most important research, development and production activities in the industries we serve. if (document.getElementById != null) The sample is internally colorless, but contains many scoriaceous inclussions and stains that provide the black color. This is a euhedral, tannish-gray anorthoclase feldspar crystal from Mt. var headTags = document.getElementsByTagName("head"); In hand specimen and thin section, the brown mafic glass typically appears homogeneous. 4 x 2.5 x 1.5 cm. From Berkum, North Rhine-Westphalia, Ge Field of view 4mm across. NWA 8171 was purchased in June 2013 in Ensisheim, France (MB103). { Anorthoclase fragments picked up on Mount Franklin, one of Victoria's volcanoes with a scoria cone. Label is about 7 cm across. Anorthoclase phenocrysts in either phonolite or trachyte. The largest crystal is also doubly terminated, as a bonus. If more than ten percent replaces the sodium, the mineral is no longer Albite, but Anorthoclase. The presense of parallel striae on cleavage surfaces distinguishes plagioclase from K-feldspar. Fig. Mineral and rock thin sections are mounted on 27 x 46 mm microscope slides, and protected by a glass coverslip. The specimen is in the Val Collins collection. Information on how these crystals formed can be found in the article "CRYSTALLIZATION PROCESSES OF ANORTHOCLASE PHENOCRYSTS IN THE MOUNT ... An elongated anorthoclase Carlsbad twin. Corundum from this area is generally heat-treated to enhance its color, especially the red (or purplish red) ruby and the blue sapphire (figure 2), which are in high demand, particularly within Thailand. Rick Dalrymple Collection. Anorthoclase Image: Images: Anorthoclase. It focuses on the practical, need-to-know information absolutely necessary for work in the laboratory. All thin section slides are labeled for reference. 3cm wide x 2.5cm. Collections of Digital Images -- Minerals in Thin Section. This flattened, floater crystal is pristine. This euhedral, gray Anorthoclase Feldspar is also double-terminated and exhibits twinning. Orthoclase is industrially important in the manufacture of glass and ceramics. Thin section (plane polarized light) of glassy phonolite (kenyte) lava with a large, sieve-textured anorthoclase crystal, Mount Kenya. Collected by K. Cashman. Kusukidani, Taiji-cho, Higashimuro district, Wakayama Prefecture, Japan. Sanidine from Mexico. html += '\n\n'; This view shows two large flakes of brownish green biotite and minor hornblende (darker smaller grains) near the left edge; the hornblende does not have a distinctive appearance. Large black anorthoclase crystal. The sample is internally colorless, but contains many scoriaceous inclussions and stains that provide the black color. Thin section slides are precisely ground to a thickness of 0.03 mm across the entire specimen area. Each thin section was first scanned in unpolarized light and then again between two sheets of crossed polaroid film aligned parallel to the thin section edges. Ex. preparing a thin section, except that acetone-soluble epoxy (Crystalbond, product . Mount Erebus, Ross Island, Ross Archipelago, Victoria Land, Eastern Antarctica, Antarctica. Thumbnail floater anorthoclase crystal from volcanic ash, Mt Kilimanjaro, 3,700 meter elevation. Ex Wolfgang E. Henkel collection. Three euhedral phenocrysts of anorthoclase from the Erebus phonolite. Home Rocks and Minerals Muscovite (thin section) Reference URL Share . It is complete all around, and undamaged, standing proud in a cluster. This piece hosts a dominant large blocky crystal of 3.0 x 1.7 x 1.5 cm, which is significantly large and fine for the material. John Rakovan photo. 1864. Anorthoclase only occurs in Na-rich felsic volcanics and This is 3.7 cm. Acquired in 2018 from Tom Katonak at the Albuquerque Treasures of the Earth Show. The piece came to Richard Kosnar from noted Mexican collector, Miguel Romero in the 1980's. It is a nearly completely black 81.88 g stone with remnants of fusion crust, whereas the interior has light-colored clasts and spheroidal objects in a brecciated matrix. You can tell plagioclase from potassium feldspar (hereby known as Kspar) because the cleavage planes of plagioclase have striations that show clearly in the light. Erebus, Antarctica One end has a clean termination, the other a notch -- looks a bit like a surfboard. Locality: Mt. Concentration of Anorthoclase per GRapi unit = 1.90 (%), Estimated Radioactivity from Anorthoclase - barely detectable. Rick Dalrymple Collection. 22944). if (printReadyElem != null) 3.4 x 2.3 x 2.2 cm html += printReadyElem.innerHTML; else Albite is the Calcium rich Plagioclase, and Anorthite is the Sodium rich Plagioclase. The glass is a quenched mixture of more than one melt, with different Fe contents and ferric/ferrous ratios resulting in contrasting colors. A longer description of this thin section is in the article about gabbro. They are thin slices that have been carefully ground down and polished so thinly that light can pass through the mineral structures.. Anorthoclase also forms tiny (up to 15 µ m) crystals in cavities (Fig. Adrienne McElwain Photo. In thin section it is almost always colorless when viewed without the analyzer inserted. Anorthoclase, (K, Na) [AlSi 3 O 8]-(Na, K)[AlSi 3 O 8], occurs in Zones VIa and VIb of the Arsenatnaya fumarole in association with diopside, forsterite, anhydrite and hematite. } When Anorthoclase forms, its atoms form in a specific arrangement. Uneven - Flat surfaces (not cleavage) fractured in an uneven pattern. collection Luigi Chiappino, Pili Mine, Saucillo Municipality, Chihuahua, Mexico. . Água de Pau Volcano, São Miguel, Azores, Portugal, A nice group of white/colourless crystals of anorthoclase Acquired from Erik Huigen at the Minerant mineral show in Antwerp, Belgium (6-7 May 2017), Pantelleria Island, Trapani Province, Sicily, Italy, Taratimi Bay, Mayor Island, Bay of Plenty Region, New Zealand. I - Data Info 2.2 x 1.0 x 0.7 cm P. Cristofono photo. The image on the top right is a photomicrograph of exsolution in microcline as seen in thin section (cross-polarized light, field of view is 2 mm). "); Collection and photograph of Rod Martin. Orthoclase crystals and twins provide information on the formation of minerals and environmental factors. Orthoclase is industrially important in the manufacture of glass and ceramics. Anorthoclase, part of a megacryst, from the quarry on the eastern hill of The Anakies. stray polarization effects. return; . Like most of the anorthoclase found in the eastern hill quarry, this crystal is not complete. They are thin slices that have been carefully ground down and polished so thinly that light can pass through the mineral structures.. Sanidine from Mexico. Crystals in this cluster range from pale blue to locally tan-pink and purple-brown with a satin to vitreous luster with the largest crystal ... Mount Kilimanjaro, Kilimanjaro Region, Tanzania. alert("Could not find the printReady section in the HTML"); 4). Large black anorthoclase crystal. These are very rare, and only a few deposits in the world produce feldspar with this shimmering, iridescent effect to them. A cluster of anorthoclase 3cm wide. Part of a translucent crystal that has been split lengthways. Erubus, Ross Island, Antarctica. The crystals show a beautiful play of colors. Sericite Named in 1852 from Latin sericus, meaning "silken" in reference to the location from which silk was first utilized, which in turn refers to the silky sheen of rocks with abundant sericite. Each thin section was first scanned in unpolarized light and then again between two sheets of crossed polaroid film aligned parallel to the thin section edges. In high-temperature sodic volcanic and hypabyssal rocks. Displaying a pearlescent blue "moonstone flash," this is a fine cluster of lustrous and translucent tan colored crystals to 3 cm across. Don Windeler collection, acquired 2019 from Chuck Trantham (CT Minerals). The biotite has a pebbly texture and micaceous cleavage.The right half of the view contains a large grain of clear to cloudy K-feldspar. Anorthoclase and augite crystals surrounding hole in basalt. Crystal is 23mm. 117912, 1171916. A deceptively subtle and beautiful cluster of transparent to translucent, color-variegated, tabular feldspar crystals from Mexico with the special optical attribute of "moon shimmer" to it. Colorless but may be cloudy. Microcline is a regular and essential ingredient of sandstone, especially feldspar arenaceous rocks and feldspar graywacke (Sections 5.5.3.2 and 5.5.3.3 Section 5.5.3.2 Section 5.5.3.3). The crystal was cleaved when the host basalt matrix was broken. For additional information, see the gemstone section on Orthoclase and Moonstone. Comments: Two white crystals of anorthoclase (possibly mislabeled and actually anorthite. A single 4.5 cm euhedral, phenocryst of anorthoclase from the Erebus phonolite. To constrain the valence state and site occupancy of iron in the minerals of NWA 2737, coauthor McCanta also acquired synchrotron Fe X‐ray near‐edge absorption spectra (SmX) from the thin section. Thin Section: Plane Light: Low negative relief. With minor aegirine. Link to , From the Greek for "oblique" and "fracture," descriptive of the cleavage, a = 8.2, b = 12.8, c = 7.1, Z = 4; alpha = 90°, beta = 116°, gamma = 90° V = 669.80 Den(Calc)= 2.64. In thin section or grain mount, the general lack of pleochroism and the twinning are good indicators. Atlas of the Rock-Forming Minerals in Thin Section C. Guilford 'Hurray for Mackenzie and Guilford for at last we have a pictorial guide to the rock-forming minerals! A - Atoms On/Off Main Atlas of the Rock-Forming Minerals in Thin Section. Rick Dalrymple Collection. function printSpecial() Albite is a very common mineral, and is an important rock-forming mineral. Adrienne McElwain Photo. A single crystal of anorthoclase 5.75cm long x 1.5cm tall. Location: Kusukidani, Wakayama Prefecture, Kinki Region, Honshu island, Japan. PROP.(Enc. Albite can contain up to ten percent potassium replacing the sodium. Rockhounds Discussion Group on Yahoo Groups With crossed polars (next image in series), the ... Rollinsons quarry, Malmsbury, Macedon Ranges Shire, Victoria, Australia. Learn more about Mineral Thin Sections. Lazurite #1 thin section (hFOV 2mm) GET 360° LIVE INTERACTION. x 2.5 cm. Anorthoclase feldspars occur as phenocrysts within the moderately vesicular pumice clasts and contain the highest Ba contents ... (∼1050°C), and bimodal temperatures for the brown (mafic) glass of banded pumice clasts. Anorthoclase crystal alert("Sorry, the print ready feature is only available in modern browsers. Thin-sections are carefully prepared glass slides suitable for mineralogical and petrology studies when viewed through a microscope. Mount Kenya National Park, Meru County, Kenya. They can only be collected during research trips to the summit of Erubus, ... Lake Keilambete, Corangamite Shire, Victoria, Australia. Source: Marcus Origlieri Orthoclase perthite thin section under microscope - YouTube Thin section (plane polarized light) of glassy phonolite (kenyte) lava with a large, sieve-textured anorthoclase crystal, Teleki Tarn, Mount Kenya. Specimen is 48mm Wide, Mount Shadwell, Mortlake, Moyne Shire, Victoria, Australia. Photographed in passing at about 12,000 feet whilst walking up Mount Kenya. x 2.8 cm. Per discussion with Matthew Zimmerer, these are ejected from Mt. Mindat.org's Discussion Groups S - Stereo Pair on/off Two white crystals of anorthoclase (possibly mislabeled and actually sanidine). 5MP Chinese unbranded CMOS camera with bellows and "2np" Reichert objective (approx equal to a plan 5-5.5x). Alex Strekeisen - I vetrini della mia fantasia. This optical mineralogy/petrography video is part of the "video atlas of minerals in thin section" library at https://www.rockptx.com. Dark gray bladed crystal. To link to this object, paste this link in email, IM or document To embed this object, paste this HTML in website. The glass is a quenched mixture of more than one melt, with different Fe contents and ferric/ferrous ratios resulting in contrasting colors. Can be confused with quartz if there is no twinning, however the optic axis figure will resolve this. It is a type of potassium feldspar, also known as K-feldspar.The gem known as moonstone (see below) is largely composed of orthoclase. Canon T2i on a Nikon PB-6 bellows and a Nikon 4X conjugate finite objective. ment of the Green Tuff. Keyboard Erebus Volcano (3794m) is home to the world’s only persistently ... Stettin pluton, Wausau Intrusive Complex, Marathon Co., Wisconsin, USA, Anorthoclase var: Wausau Moonstone of the Stettin Pluton. Thin sections were examined using standard petrographic practices under transmitted and reflected light with a Nikon Optiphot polarizing microscope at the Nevada Bureau of Mines and Geology, University of Nevada, Reno, NV, USA. Brown, partial crystal of Anorthoclase, 10x10mm. Processed with Zerene stacker DMap and post stacking cleanup with Faststone. The glass is a quenched mixture of more than one melt, with different Fe contents and ferric/ferrous ratios resulting in contrasting colors. 5cm x1.5cm x 0.75cm crystal from Mt. Espa�ol 8.6 x 5.3 x 3.7 cm. The piece came to Richard Kosnar from noted Mexican collector, Miguel Romero in the 1980's. Anorthoclase only occurs in Na-rich felsic volcanics and if (headTags.length > 0) The white material is kenyaite. K-feldspar, Quartz and Biotite in a Granite. html += headTags[0].innerHTML; var printWin = window.open("","printSpecial", 'toolbar=no,location=no,directories=no,status=no,menubar=no,scrollbars=yes,resizable=yes,copyhistory=yes,width=350,height=350'); Not sure if its a body fossil of a soft-bodied organism or a trace fossil. Mineral Discussion Forum from Fabre Minerals - also available in { Color. (Heinrich65). printWin.document.write(html); Orthoclase crystals and twins provide information on the formation of minerals and environmental factors. The structural state which is the basis of the alkali feldspar classification, is dependent on the temperature of crystallization and subsequent cooling history. Anorthoclase is an alkali feldspar that is sodic in composition. This thin section was used for petrographic descriptions, mineral abundances , and chemical analysis. such feasts of colour in mineralogy books are rare . Photo and collection: Giovanni Scapin. Muscovite (thin section) View Description. The biotite has a pebbly texture and micaceous cleavage.The right half of the view contains a large grain of clear to cloudy K-feldspar. Microcline is a regular and essential ingredient of sandstone, especially feldspar arenaceous rocks and feldspar graywacke (Sections 5.5.3.2 and 5.5.3.3 Section 5.5.3.2 Section 5.5.3.3). Add tags Comment Rate. P - Polyhedra On/Off Many of these sanidine specimens came out with Benny Fenn in the 1990s but now they are seldom seen. Feldspar - Feldspar - Identification of specific feldspars: Alkali feldspars can often be distinguished from plagioclase feldspars because most grains of the latter exhibit albite twinning (see above Crystal structure), which is manifested by parallel lines on certain cleavage surfaces, whereas grains of alkali feldspars do not. Partly transparent crystals to 3 cm of Anorthoclase (var. Erebus, near the USA's McMurdo Station in Antarctica are considered to be some of the best examples of the species known. One other K-spar to watch out for: Anorthoclase: Resembles microcline in thin section, but the tartan twinning is much finer and the 2V is smaller. with individual crystals up to 1.3 cm. Rick Dalrymple Collection. Many of these sanidine specimens came out with Benny Fenn in the 1990s but now they are seldom seen. From Chuck's personal ... Harvard Mineralogical Museum specimen nos. This piece hosts a dominant large crystal of 3.5 x 2.5 x 1.0 cm, which is significantly large and fine for the material. The orientation of the (0k0) crystallographic planes, as measured in the (060) pole figure is equivalent to the shortest crystal length of sanidine and anorthoclase in the thin‐section analysis, whereas the crystal faces that contain the intermediate and longest sides of anorthoclase and sanidine correlate to the orientation measured in the (–201) pole figures shown in Figure 8. Mt Kibo, Mount Kilimanjaro, Kilimanjaro Region, Tanzania. Dark grey, bladed crystal of anorthoclase. In thin section, alkali feldspar grains often look like they’re sprinkled with dirt (PPL) or tiny confetti … Field of view: 7cm. Rolf Luetcke specimen and photo. Using various methods of melt inclusion investigation, including electron and ion microprobe techniques, we estimated the composition, evolution, and formation conditions of melts producing the trachydacites and pantellerites of the Late Paleozoic bimodal volcanic association of Dzarta-Khuduk, Central Mongolia. Phonolite is a fine-grained equivalent of nepheline syenite.They are products of partial melting, are silica-undersaturated, and have feldspathoids in their normative mineralogy.. } These Anorthoclase are some of the best examples of the species known, and come from the crater of Mt. Photo with Canon Eos 600 D + Bellows + Rodenstock Rodagon 35 mm 1:4.3 reversed Crossed Polars: Biaxial (-), 2V is greater than 40°. if (gAutoPrint) The focus of this study, the Bo Welu gem field located in the central gem deposits, has been mined for both ruby and sapphire. } The sample is internally colorless, but contains many scoriaceous inclussions and stains that provide the black color. For additional information, see the gemstone section on Orthoclase and Moonstone. { 4.5 x 2.5 x 1.5 cm. Specimen and photo: Knut Eldjarn. Hillside xenocryst locality, Vernon Co., New South Wales, Australia. A twinned euhedral crystal of 'anorthoclase' coated in volcanic glass.

 _uacct = "UA-3067463-1"; . The specimens from the crater of Mt. large sharp sanidine with skeletal growth features, 5mm terminated aegirine crystals and strong schiller, Wingertsberg, Mendig, Mendig, Mayen-Koblenz District, Rhineland-Palatinate, Germany, Small blocky Anorthoclase crystal on unidentified matrix Franklin Mine, Franklin, Franklin Mining District, Sussex County, New Jersey, USA. printWin.print(); Specimen# 45-97 : Benmoreite in thin section. Collection and photograph of Rod Martin, Poudrette quarry, Mont Saint-Hilaire, La Vallée-du-Richelieu RCM, Montérégie, Québec, Canada, Massive green. A. Stevenson collection #529. Thin section microscope slide,when available, $48.00 . Can be confused with quartz if there is no twinning, however the optic axis figure will resolve this. Orthoclase, or orthoclase feldspar (endmember formula K Al Si 3 O 8), is an important tectosilicate mineral which forms igneous rock.The name is from the Ancient Greek for "straight fracture," because its two cleavage planes are at right angles to each other. 18. From the quarry on the middle hill of The Anakies, anorthoclase in a basalt matrix. Blocky colorless crystals of sanidine to 2.4 cm in size are covering a 6.7 x 5.6 x 3.7 cm matrix. © John Betts - Fine Minerals, Mouse Field of view: 12mm. drag1 - LMB Manipulate Structure Synonyms [ edit ] } Here we have a rarely available mineral species and specimen. Information about Anorthite and its properites. Nagy-kő, Bárna, Nógrád County, Hungary. Feldspars have no color of their own because they lack chromofore chemical elements in their structure. Adrienne McElwain Photo. In thin section or grain mount, the general lack of pleochroism and the twinning are good indicators. urchinTracker(); Print or Cut-and-Paste your Anorthoclase Specimen Label here : Measured S.G. : 2.57 gr/cm3 number 509) was used for cementing the rock to the glass slide. Partly embedded in scoria, a megacryst of anorthoclase showing some rounding from the effects of the magma. August, 2000. The crystals show a beautiful play of colors. Erubus, near the USA's McMurdo Station in Antarctica. Thin section photomicrograph, cross polars, of fresh and extremely glassy phonolite collected on the northern route into the caldera. collection Luigi Chiappino. { onto the matrix Twinned. The largest crystal measures 6 cm tall. These can be either color and are easiest to distinguish in thin section. Photographed by and in the collection of Doug Merson. The xenocryst of anorthoclase shows a rounded and frosted exterior which is indicative of magmatic corrosion. An unnecessary name for a variety of Anorthoclase with the tabular habit of sanidine but the optical extinction of Anorthoclase. Sanidine from Mexico. The white on the outside is kenyaite. Obtained from László Horváth, Eastern Hill, Mount Anakie, Anakie, City of Greater Geelong, Victoria, Australia. Middle Hill, Mount Anakie, Anakie, City of Greater Geelong, Victoria, Australia. Anorthite gems for sale. Scale: 15x14x6 mm. The crystals show a silvery or ... Crystals of sanidine in matrix. John Rakovan photo. This cleavage fragment picked up among the scoria is lustrous and translucent and shows a rounded outline from contact with the magma. One of its most distinguishing properties in thin section is that it usually has a smooth, almost polished-like surface texture. Anorthoclase with less than 10% KAlSi3O8: Anorthoclase-Sanidine: Feldspar Group.

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