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Staurolite information


Staurolite
Staurolite from Pestsovye Keivy, Keivy Mountains, Kola Peninsula, Murmanskaja Oblast', Northern Region, Russia, 2.5 × 2.2 × 1 cm
General
CategoryNesosilicate
Formula
(repeating unit)		Fe2+2Al9O6(SiO4)4(O,OH)2[1]
IMA symbolSt[2]
Strunz classification9.AF.30
Crystal systemMonoclinic
Crystal classPrismatic (2/m)
(same H-M symbol)
Space groupC2/m
Unit cella = 7.86 Å, b = 16.6 Å
c = 5.65 Å; β = 90.45°; Z = 2
Identification
ColorDark reddish brown to blackish brown, yellowish brown, rarely blue; pale golden yellow in thin section
Crystal habitCommonly in prismatic crystals
TwinningCommonly as 60° twins, less common as 90° cruciform twins
CleavageDistinct on {010}
FractureSubconchoidal
TenacityBrittle
Mohs scale hardness7 – 7.5
LusterSubvitreous to resinous
StreakWhite to grayish
DiaphaneityTransparent to opaque
Specific gravity3.74 – 3.83 meas. 3.686 calc.
Optical propertiesBiaxial (+)
Refractive indexnα = 1.736 – 1.747 nβ = 1.740 – 1.754 nγ = 1.745 – 1.762
Birefringenceδ = 0.009 – 0.015
PleochroismX = colorless; Y = pale yellow; Z = golden yellow
2V angleMeasured: 88°, Calculated: 84° to 88°
Dispersionr > v; weak
References[3][4][5]

Staurolite is a reddish brown to black, mostly opaque, nesosilicate mineral with a white streak. It crystallizes in the monoclinic crystal system, has a Mohs hardness of 7 to 7.5 and the chemical formula: Fe2+2Al9O6(SiO4)4(O,OH)2. Magnesium, zinc and manganese substitute in the iron site and trivalent iron can substitute for aluminium.[1]

  1. ^ a b Klein, Cornelis and Cornelius S. Hurlbut, Jr., Manual of Mineralogy, Wiley. 20th ed., 1985, p. 382 – 3 ISBN 0-471-80580-7
  2. ^ Warr, L.N. (2021). "IMA–CNMNC approved mineral symbols". Mineralogical Magazine. 85 (3): 291–320. Bibcode:2021MinM...85..291W. doi:10.1180/mgm.2021.43. S2CID 235729616.
  3. ^ http://rruff.geo.arizona.edu/doclib/hom/staurolite.pdf Handbook of Mineralogy
  4. ^ http://www.mindat.org/show.php?id=3753&ld=1&pho= Mindat.org
  5. ^ http://webmineral.com/data/Staurolite.shtml Webmineral data

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Staurolite

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Staurolite is a reddish brown to black, mostly opaque, nesosilicate mineral with a white streak. It crystallizes in the monoclinic crystal system, has...

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Metamorphic rock

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minerals are known as index minerals. Examples include sillimanite, kyanite, staurolite, andalusite, and some garnet. Other minerals, such as olivines, pyroxenes...

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Kyanite

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minerals are useful as well, especially the presence of the polymorphs of staurolite, which occurs frequently with kyanite. However, the most useful characteristic...

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Crystal twinning

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the mineral as are its crystal face angles. For example, crystals of staurolite show twinning at angles of almost precisely 90 degrees or 30 degrees....

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Fairy Stone State Park

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opened on June 15, 1936, and is home to the mysterious "fairy stones", or staurolite. The stone, prevalent in the region, may have the St. Andrew's or Roman...

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Sericite

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cross-polarized light in which feldspar crystals exhibit sericite alteration Staurolite-garnet schist in thin section under cross-polarized light with sericite...

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Index mineral

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muscovite, biotite, garnet, sodic plagioclase Staurolite zone: quartz, muscovite, biotite, garnet, staurolite, plagioclase Kyanite zone: quartz, muscovite...

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List of gemstones by species

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) Spodumene Hiddenite (var.) Kunzite (var.) Triphane (var.) Spurrite Staurolite Stibiotantalite Stichtite Stolzite Strontianite Strontium titanate Sulfur...

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Schist

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(individual crystals of unusual size) of distinctive minerals, such as garnet, staurolite, kyanite, sillimanite, or cordierite. Because schists are a very large...

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Silicate mineral

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Al2SiO5 Dumortierite – Al 6.5–7BO 3(SiO 4) 3(O,OH) 3 Topaz – Al2SiO4(F,OH)2 Staurolite – Fe2Al9(SiO4)4(O,OH)2 Humite group – (Mg,Fe)7(SiO4)3(F,OH)2 Norbergite...

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Blanchard Dam

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also one of very few known places on earth where Staurolite is found. Here, the mineral Staurolite sometimes forms cross rocks or “fairy stones”. Blanchard...

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Rinconada Formation

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of staurolite gneiss and schist, from 60 meters (200 feet) to 150 meters (490 feet) thick, which contains porphyroblasts of garnet and staurolite up to...

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Simandou mine

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and up to 1 km wide. At both banded iron formations (metamorphosed to staurolite-grade itabirites) have been enriched to form haematite and haematite-goethite...

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Amphibolite

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quartz, orthoclase +/- albite, +/- biotite +/- actinolite +/- garnet +/- staurolite +/- sillimanite Amphibolite facies is usually a product of Barrovian Facies...

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Mineral

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grown into each other; examples of this twinning include cross-shaped staurolite twins and Carlsbad twinning in orthoclase. Cyclic twins are caused by...

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Fairy stone

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Fairy stone may refer to: The mineral staurolite Certain calcium carbonate concretions in clay Fairy Stone State Park in Patrick County, Virginia This...

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List of minerals

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Sphalerite Spherocobaltite Spinel Spodumene Spurrite Stannite Stannoidite Staurolite Steacyite Stellerite Stephanite Stercorite Stibarsen Stibiconite Stibiopalladinite...

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Garnet

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metamorphic rocks like mica schists, associated with minerals such as staurolite, kyanite, andalusite, and others. Almandine has nicknames of Oriental...

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List of mineral symbols

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Sro Sulfoborite Sbo Samarskite-(Y) Smk-Y Scorodite Scd Siidraite Sii Staurolite St Sulphohalite Slhl Samarskite-(Yb) Smk-Yb Scorticoite Srt Silesiaite...

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Crystal habit

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right- and left-handed crystals aragonite, gypsum, quartz, plagioclase, staurolite Hexagonal Hexagonal prism (six-sided) beryl, galena, quartz, hanksite...

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Metamorphism

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---------------------- Gneiss --- Migmatite Chlorite zone Biotite zone Garnet zone Staurolite zone Kyanite zone Sillimanite zone A more complete indication of this...

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Gedrite

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anthophyllite, cummingtonite, sapphirine, sillimanite, kyanite, quartz, staurolite and biotite. Gedrite was first described for an occurrence in Gèdre, Hautes-Pyrenees...

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Petrogenetic grid

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from the chlorite zone to the biotite zone to the garnet zone to the staurolite zone. For a metapelitic rock containing chlorite, kaolinite, and quartz...

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Pelite

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assemblage changes from predominantly chlorite to biotite to garnet to staurolite to kyanite to sillimanite. This later turned out to be overly simplistic...

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Piedra Lumbre Formation

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staurolite phyllitic schist. This is characterized by light gray crenulated cleavage surfaces sprinkled with small garnet, biotite, and staurolite crystals...

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Mount Moosilauke

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Formation is primarily a mica schist with zones containing garnet and staurolite-sillimanite. The unit also contains interbedded amphibolites. The mica...

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