staurolite
Instance URI: http://resource.geosciml.org/classifier/cgi/commodity-code/staurolite
Within scheme: South Australian Commodity Codes
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.