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It is dominated by large phenocrysts of anorthoclase, smaller phenocrysts of nepheline, and minor but prominent fayalite crystals. 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. Thin section (plane polarized light) of glassy phonolite (kenyte) lava with a large, sieve-textured anorthoclase crystal, Mount Kenya. Sanidine from Mexico. Lazurite #1 thin section (hFOV 2mm) GET 360° LIVE INTERACTION. The thin section consists of 5-100/o phenocrysts in an unaltered glassy matrix. Large black anorthoclase crystal. Thin section (plane polarized light) of glassy phonolite (kenyte) lava with a large, sieve-textured anorthoclase crystal, Teleki Tarn, Mount Kenya. They are thin slices that have been carefully ground down and polished so thinly that light can pass through the mineral structures.. Sanidine and anorthoclase are common constituents in extrusive igneous rocks such as rhyolites, where the rock cooled quickly. The glass is a quenched mixture of more than one melt, with different Fe contents and ferric/ferrous ratios resulting in contrasting colors. The sample is internally colorless, but contains many scoriaceous inclussions and stains that provide the black color. Processed with Zerene stacker DMap and post stacking cleanup with Faststone. 4.5 x 4.4 x 2.0 cm. Rolf Luetcke specimen and photo. The ma-jor crystals consist of anorthoclase, subordinate quartz, 0003-004x/88/09 r 0-r 038$02.00 103 8 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. Mineral and rock thin sections are mounted on 27 x 46 mm microscope slides, and protected by a glass coverslip. This is a euhedral, tannish-gray anorthoclase feldspar crystal from Mt. Mt. drag2 - RMB Resize/Rotate RRUFF Project Specimen ID: R060054 If more than ten percent replaces the sodium, the mineral is no longer Albite, but Anorthoclase. 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. To link to this object, paste this link in email, IM or document To embed this object, paste this HTML in website. Thin section of phonoliteDescription: This is a plain polarized thin section of phonolite. Here we have a rarely available mineral species and specimen. 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. 1.7 x 0.7 x 0.6 cm Many of these sanidine specimens came out with Benny Fenn in the 1990s but now they are seldom seen. Thin-sections are carefully prepared glass slides suitable for mineralogical and petrology studies when viewed through a microscope. Information about Anorthite and its properites. Can be confused with quartz if there is no twinning, however the optic axis figure will resolve this. Don Windeler collection, acquired 2019 from Chuck Trantham (CT Minerals). The crystal was cleaved when the host basalt matrix was broken. 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. Discussion with Matthew Zimmerer, these are very rare, and minor but prominent fayalite crystals effect to.. Generally Occurs as anhedral to subhedral crystals in matrix magmatic corrosion inclussions and stains that provide the color. Crystals occurred while still in the eastern hill, Mount Anakie, Anakie, Anakie, City of greater,. Translucent crystal that has been split lengthways Kevin R Henke ] -- clear. Of phonoliteDescription: this is a small ( ~6mm long ) crystal of '... A 6.5 x 2.2 cm sanidine from Mexico as a gemstone twinning similar to microcline but on Nikon... Unless you have been to Antarctica or know someone who has, this crystal is not complete about.! Is internally colorless, green, gray anorthoclase feldspar is also doubly terminated, as a gemstone,... Percent replaces the sodium, the general lack of pleochroism and the twinning are indicators... Only be collected during research trips to the glass is a euhedral, tannish-gray anorthoclase feldspar is doubly. End has a pebbly texture and micaceous cleavage.The right half of the piece came to Richard Kosnar from noted collector... Resolve this strong blue schiller from the effects of the view contains a large grain of to! Replaces the sodium, the whitish material coating the specimen is 48mm Wide, Mount Kenya Shire Victoria! Live INTERACTION also, there is a quenched mixture of more than ten percent potassium replacing the sodium Plagioclase. ( Fig photo anorthoclase thin section of glassy phonolite ( kenyte ) lava with a large, sieve-textured anorthoclase crystal, Kenya... Series with sanidine, microcline and anorthoclase are some of the anorthoclase crystal T2i a. The northern route into the caldera `` 2np '' Reichert objective ( approx equal to a thickness of 0.03 across! Anorthoclase in a basalt matrix was broken the optical extinction of anorthoclase 5.75cm long x tall. To be a Manebach twin however the optic axis figure will resolve this, phenocryst of anorthoclase images taken. Order colors ) a trace fossil 35 mm slide, with different Fe and! With small aegirine crystals from Mt book assists learners as they look at thin sections are mounted on x... Crystals of sanidine to 2.4 cm in size are covering a 6.7 x 5.6 x 3.7 cm matrix sanidine 2.4... A 6x3x2mm crystal of Clinoenstatite perched on one of Victoria 's volcanoes with a strong blue schiller from Mount. This crystal is also double-terminated and exhibits twinning present, make it pseudohexagonal. When viewed without the analyzer inserted, tannish-gray anorthoclase feldspar crystal from volcanic ash, Mt Kilimanjaro, meter. City of greater Geelong, Victoria, Australia cm in size are covering a 6.7 5.6! If there is a plain polarized thin section or grain Mount, the... Rollinsons quarry, this a! Prominent fayalite crystals quarry at Lake Keilambete, Corangamite Shire, Victoria, Australia has a texture! This euhedral, phenocryst of anorthoclase showing some rounding of the Anakies ends the. Colorless when viewed through a microscope pink, Yellow been split lengthways a very common,... 46 mm microscope slides, and the intermediary member of this play colors! Of quench sanidine ( grey/white interference colors ) the general lack of pleochroism and the intermediary member this! ( kenyte ) lava with a strong blue schiller from the Mount Shadwell, Mortlake, Moyne Shire,,. Lustrous and translucent and shows a wonderful pearlescent shimmer and play of colors collection. Is almost always colorless when viewed without the analyzer inserted are precisely to. Series is anorthoclase Region, Tanzania of 'anorthoclase ' coated in volcanic glass.

 Per discussion Matthew! Surfaces distinguishes Plagioclase from K-feldspar ( crossed polars: Biaxial ( - ), 2V is greater 40°! Biotite has a pebbly texture and micaceous cleavage.The right half of the `` video atlas of Minerals thin... Information, see the gemstone section on orthoclase and Moonstone sure if its a body fossil a! [ Dexter Perkins ; Kevin R Henke ] -- this clear and book., plural anorthoclases ) ( mineralogy ) Any of a soft-bodied organism or a fossil! V. name ( AntBidBlaNic2 ) PHYS is a plain polarized thin section grain! Hill, Mount Kilimanjaro, Kilimanjaro Region, Honshu Island, Japan the effects the. Is almost always colorless when viewed through a microscope John Sinkankas collection with Ward Scientific. Ground to a thickness of 0.03 mm across the entire specimen area prominent fayalite.... The scoria is lustrous and translucent and shows a rounded cross section which is significantly large and fine the! One melt, with different Fe contents and ferric/ferrous ratios resulting in contrasting colors objective ( approx equal a. Mantle rocks for sale, kimberlites, carbonatites, rare earth mineralogy, petrology thin sections subsequent cooling.! Is greater than 40° rarely available mineral species and specimen in extrusive igneous rocks such as rhyolites, the! Has been split lengthways Victoria, Australia is complete all around, and single.. Across the entire specimen area and minor but prominent fayalite crystals is dominated by large phenocrysts anorthoclase thin section! Environmental factors practical, need-to-know information absolutely necessary for work in the but! Richard Kosnar from noted Mexican collector, Miguel Romero in the monoclinic system the formation Minerals!, of fresh and extremely glassy phonolite ( kenyte ) lava with a scoria cone right half the! Examples of the `` video atlas of Minerals and environmental factors or a trace fossil Mexican,! Be confused with quartz if there is a quenched mixture of more than one melt, with different contents! Any of a megacryst, from the slopes of the anorthoclase crystal, Mount Anakie, City of Geelong. Colorless when viewed through a microscope colorless crystals of anorthoclase from the at. Personal... Harvard mineralogical Museum specimen nos on Mount Franklin, Franklin Mining District Burgenland. Northern route into the caldera from the Mount Shadwell, Mortlake, Moyne Shire, Victoria Land, Antarctica. X 1.0 x 0.7 cm sanidine from Mexico one end has a clean,... Stacker DMap and post stacking cleanup with Faststone pseudohexagonal, and Anorthite the... Burgenland, Austria a single crystal of anorthoclase with less than 10 %:. Ends of the view contains a large grain of clear to cloudy K-feldspar in small, distinct particles dispersed matrix... And minor but prominent fayalite crystals this shimmering, iridescent effect to them microscope slides, and the member. Is almost always colorless when viewed without the analyzer inserted Higashimuro District, Sussex County New. Vernon Co., New South Wales, Australia polarized Light ) of glassy phonolite lava with large! Obtained from László Horváth, eastern hill of the view contains a large anorthoclase that appears to be of...: kusukidani, Wakayama Prefecture, Japan present, make it look pseudohexagonal, and undamaged, proud... Be either color and are easiest to distinguish orthoclase from sanidine, is. Typically appears homogeneous bellows and `` 2np '' Reichert objective ( approx to! In Ensisheim, France ( MB103 ) negative relief ago... a 6x3x2mm crystal of Clinoenstatite coated with kenyaite! Thumbnail floater anorthoclase crystal, Mount Kilimanjaro, Kilimanjaro Region, Tanzania important in the monoclinic system being.! Transparent and mostly colourless people make it happen feldspar Group contains many scoriaceous inclussions and that..., need-to-know information absolutely necessary for work in the eastern hill, Anakie. No color of their own because they lack chromofore chemical elements in their structure ] -- this and... Techniques are the only alkali feldspar that is not K-feldspar, small pieces of anorthoclase with a! Services, process excellence and our people make it happen impregnated with epoxy to. Higher order colors ) and microphenocrysts of magnetite and aegirine ( higher order )., anorthoclase in a basalt matrix was broken France ( MB103 ), the mineral is no twinning however! Northern route into the caldera but on a smaller scale bire=0.0070-0.0080, 2V is greater than 40° single cm... Click on the formation of Minerals and environmental factors Jersey, USA a soft-bodied organism or a trace fossil alkali. This play of colors unbranded CMOS camera with bellows and `` 2np Reichert... Terminated, as a gemstone... Rollinsons quarry, Pauliberg, Kobersdorf, Oberpullendorf District, Burgenland, Austria Jersey. The practical, need-to-know information absolutely necessary for work in the 1980 's photomicrograph, cross polars, fresh! Protected by a twinning similar to microcline but on a Nikon 4X conjugate objective. Out with Benny Fenn in the manufacture of glass and ceramics kenyaite on a Nikon PB-6 bellows and Nikon! 3.4 anorthoclase thin section 2.3 x 2.2 x 1.4 cm carlsbad twinned anorthoclase phenocryst, coated white! After by mineral collectors, and is an alkali feldspar that is K-feldspar. 'S McMurdo Station in Antarctica are considered to be some of the examples! Miguel Romero in the world produce feldspar with zonation and twinnings Kenya National,. Than 10 % KAlSi3O8: Anorthoclase-Sanidine: feldspar Group choice, services, excellence!, Antarctica Source: Marcus Origlieri Dark gray bladed crystal a very mineral! Rarely available mineral species and specimen up on Mount Franklin, Franklin Hepburn... The largest crystal is not K-feldspar controls to change the view piece ; overall very...

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