1952. 16 - Minerals in Thin Section-University of North Carolina 17 - Minerals in Thin Sections-Humboldt State 18 - Online Mineral Museum 19 - QUT Mineral Atlas 20 - Ruff.Info 21 - Scandinavian mineral gallery 22 - UCLA - Petrography Thin-Sections 23 - WWW-MINCRYST 24 - theimage. Note: Staurolite typically has short prismatic habit and frequently contains quartz inclusions, Return to top Rock-forming minerals of metamorphic rocks, in thin section (a work in progress) Atlas of Metamorphic Minerals. Associated with medium pressure, medium temperature metamorphism, Rock-forming minerals associated with Staurolite: Biotite, Muscovite, Quartz, Garnet Other index minerals commonly associated with Staurolite: Kyanite. It ranges from transparent to opaque in diaphaneity. Staurolite's hand sample has characteristic penetration twinning and unique crystal habit. Staurolite thin section. This example has a twin, highlighted by different color and birefringence caused by its different orientation. May resemble tourmaline in thin section, but tourmaline is uniaxial. Staurolite is a silicate mineral with a generalized chemical composition of (Fe,Mg) 2 Al 9 Si 4 O 23 (OH). Return to index minerals introduction The mineral often forms porphyroblasts.. Oct 2, 2020 - Explore Bryn Mawr College Mineralogy's board "Minerals in Thin Section", followed by 119 people on Pinterest. In hand sample, staurolite frequently occurs as twinned prismatic crystals known as “fairy stones” or “fairy crosses.” In thin section, it displays a poikiloblastic texture which people often liken to vomit spatter—gross, but effective. Key optical features of staurolite in thin section: Common minerals that might be confused with staurolite and occur in similar rocks: Staurolite often occurs twinned in a characteristic cross-shape, called cruciform penetration twinning. Garnet (isotropic, high relief), Twitter. Properties of Staurolite. In handsamples, macroscopically visible staurolite crystals are of prismatic shape. Enjoy the videos and music you love, upload original content, and share it all with friends, family, and the world on YouTube. Key optical features of staurolite in thin section: Pale Yellow Moderate relief No cleavage, common fractures Low-Moderate order interference colours. Magnification: 40x To see this mineral in PPL, click here: https://youtu.be/ppJP74V6Z88 To explore this slide in PPL, click her…, Staurolite at webmineral.com Return to introduction. Staurolite at mindat.org, Staurolite in muscovite staurolite schist. Note: Staurolite typically displays grey-yellow interference colours. Staurolite in crossed polars, Staurolite displaying its characteristic yellow-brown pleochroism. Share. See more ideas about minerals, geology, metamorphic rocks. General Staurolite Information : Chemical Formula: (Fe++,Mg)2Al9(Si,Al)4O20(O,OH)4 ... Minerals in Thin Section-University of North Carolina 17 - Minerals in Thin Sections-Humboldt State 18 - Online Mineral Museum 19 - QUT Mineral Atlas 20 - Ruff.Info 21 - Scandinavian mineral gallery Staurolite Email. Staurolite in muscovite staurolite schist, Staurolite in  plane polars Magnification: 40x To see this mineral in XPL, click here: https://youtu.be/O2gvC6wvqEg To…, Staurolite in crossed polars. The thin section contains many small, inclusion poor grains of staurolite, which is a high relief mineral pleochroic with colours ranging from pale yellow to almost colourless in plane polarised light, and with low birefringence colours in crossed polars. This example has a twin, highlighted by different color and birefringence caused by its different orientation. Rock-forming minerals of metamorphic rocks, in thin section (a work in progress) ... 32 Staurolite Staurolite showing internal inclusion fabric, in schist. Although commonly light yellow-green in thin section, it may be colorless. Plane-polarised light, field of view 1 mm. It is usually brown or black in color with a resinous to vitreous luster. About Staurolite. In general, it has an isolated tetrahedral structure related to that of kyanite. Although commonly light yellow-green in thin section, it may be colorless. In hand sample, staurolite frequently occurs as twinned prismatic crystals known as “fairy stones” or “fairy crosses.” In thin section, it displays a poikiloblastic texture which people often liken to vomit spatter—gross, but effective. Return to index minerals Return to introduction, Mineral structure: Single SiO4 structure, Common mineral in Pelites (Schists & Gneisses) Search for Staurolite using: The crystals are brown, red or yellow in color. Facebook. Staurolite is a metamorphic mineral that is found almost exclusively in medium-grade schists. Andalusite (colourless, cleavage), Note: Complete or partial alteration to fine grained muscovite around margins and along fractures associated with influx of fluids. In thin sections staurolite is commonly twinned and shows lower first order birefringence similar to quartz, with the twinning displaying optical continuity. Staurolite has parallel extinction and one cleavage parallel to its length, and has a characteristic pale to darker golden yellow pleochroism. Staurolite has parallel extinction and one cleavage parallel to its length, and has a characteristic pale to darker golden yellow pleochroism. Staurolite - (Fe 2+,Mg,Zn) 2 (Al,Fe 3+,Ti) 9 O 6 [(Si,Al)O 4] 4 (O,OH) 2 The name "staurolite" is from the Greek word "stauros" which means "cross". Occurrence: Staurolite is found in medium-grade pelitic metamorphic rock, and is used as an index mineral in metamorphic zoning. Common minerals that might be confused with staurolite and occur in similar rocks: Garnet (isotropic, high relief), Kyanite (high relief, cleavage) Andalusite (colourless, cleavage) Kyanite (high relief, cleavage) The mineral commonly occurs as twinned, six-sided crystals that sometimes intersect at 90 degrees to form a cross …
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