Staurolite

Staurolite is a red 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. ==Properties== ...
Found on http://en.wikipedia.org/wiki/Staurolite

Staurolite

• (n.) A mineral of a brown to black color occurring in prismatic crystals, often twinned so as to form groups resembling a cross. It is a silicate of aluminia and iron, and is generally found imbedded in mica schist. Called also granatite, and grenatite.
Found on http://thinkexist.com/dictionary/meaning/staurolite/

Staurolite

Stau'ro·lite noun [ Greek ... a cross + -lite .] (Min.) A mineral of a brown to black color occurring in prismatic crystals, often twinned so as to form groups resembling a cross. It is a silicate of aluminia and iron, and is generally found imbedded in mica schist. Called also granatit...
Found on http://www.encyclo.co.uk/webster/S/188

staurolite

silicate mineral [(Fe,Mg,Zn)3-4Al18Si8O48H2-4] produced by regional metamorphism in rocks such as mica schists, slates, and gneisses, where it is ...
Found on http://www.britannica.com/eb/a-z/s/156

Staurolite

Staurolite is an brown, vitreous accessory mineral found in crystalline schists, slates, and sometimes gneisses and often associated with garnet, kyanite, and tourmaline. It has the formulae (Fe,Mg,Zn)2Al9Si4O23(OH) and a relative hardness of 8.
Found on http://www.probertencyclopaedia.com/browse/HS.HTM

staurolite

staurolite, staurolitic Literally, 'cross-stone'; a reddish-brown or black mineral of iron and magnesium that occurs as prismatic crystals in metamorphic rocks, often in a cross shape. It is used as a gemstone that often forms twin crystals in the shape of a cross. The term metamorphism refers to a change in the physical structure of rock that resu...
Found on http://www.wordinfo.info/words/index/info/view_unit/2027/
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