Note: Staurolite typically displays grey-yellow interference colours. Common minerals that might be confused with staurolite and occur in similar rocks: Garnet (isotropic, high relief), Kyanite (high relief, cleavage) Andalusite (colourless, cleavage) Magnification: 40x To see this mineral in XPL, click here: https://youtu.be/O2gvC6wvqEg To…, Staurolite in crossed polars. Search for Staurolite using: Other index minerals commonly associated with Staurolite: Kyanite. 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. Staurolite in muscovite staurolite schist, Staurolite in plane polars Key optical features of staurolite in thin section: Pale Yellow Moderate relief No cleavage, common fractures Low-Moderate order interference colours. In general, it has an isolated tetrahedral structure related to that of kyanite. 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 Share. Facebook. Enjoy the videos and music you love, upload original content, and share it all with friends, family, and the world on YouTube. Associated with medium pressure, medium temperature metamorphism, Rock-forming minerals associated with Staurolite: Biotite, Muscovite, Quartz, Garnet About Staurolite. Note: Staurolite typically has short prismatic habit and frequently contains quartz inclusions, Return to top The mineral often forms porphyroblasts.. Email. This example has a twin, highlighted by different color and birefringence caused by its different orientation. The mineral commonly occurs as twinned, six-sided crystals that sometimes intersect at 90 degrees to form a cross … Return to index minerals introduction 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 Key optical features of staurolite in thin section: Common minerals that might be confused with staurolite and occur in similar rocks: Staurolite in crossed polars, Staurolite displaying its characteristic yellow-brown pleochroism. Andalusite (colourless, cleavage), Note: Complete or partial alteration to fine grained muscovite around margins and along fractures associated with influx of fluids. 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". May resemble tourmaline in thin section, but tourmaline is uniaxial. See more ideas about minerals, geology, metamorphic rocks. Although commonly light yellow-green in thin section, it may be colorless. Oct 2, 2020 - Explore Bryn Mawr College Mineralogy's board "Minerals in Thin Section", followed by 119 people on Pinterest. Staurolite is a silicate mineral with a generalized chemical composition of (Fe,Mg) 2 Al 9 Si 4 O 23 (OH). Kyanite (high relief, cleavage) Properties of Staurolite. Plane-polarised light, field of view 1 mm. Rock-forming minerals of metamorphic rocks, in thin section (a work in progress) Atlas of Metamorphic Minerals. This example has a twin, highlighted by different color and birefringence caused by its different orientation. In thin sections staurolite is commonly twinned and shows lower first order birefringence similar to quartz, with the twinning displaying optical continuity. Staurolite thin section. It ranges from transparent to opaque in diaphaneity. Occurrence: Staurolite is found in medium-grade pelitic metamorphic rock, and is used as an index mineral in metamorphic zoning. Staurolite has parallel extinction and one cleavage parallel to its length, and has a characteristic pale to darker golden yellow pleochroism. Although commonly light yellow-green in thin section, it may be colorless. It is usually brown or black in color with a resinous to vitreous luster. 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. Twitter. 1952. 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. Staurolite often occurs twinned in a characteristic cross-shape, called cruciform penetration twinning. Rock-forming minerals of metamorphic rocks, in thin section (a work in progress) ... 32 Staurolite Staurolite showing internal inclusion fabric, in schist. Staurolite The crystals are brown, red or yellow in color. Return to index minerals Return to introduction, Mineral structure: Single SiO4 structure, Common mineral in Pelites (Schists & Gneisses) Staurolite's hand sample has characteristic penetration twinning and unique crystal habit. Staurolite at mindat.org, Staurolite in muscovite staurolite schist.
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