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staurolite

http://resource.geosciml.org/classifier/cgi/commodity-code/staurolite

definition 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. more like this
notation
01.02.39 more like this
Stau more like this
source http://en.wikipedia.org/wiki/Staurolite more like this
type
Resource original
Concept original
broader
http://resource.geosciml.org/classifier/cgi/commodity-code/industrial-mineral original
narrower staurolite original
in scheme commodity-code original
is primary topic of staurolite