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Staurolite
Name
Staurolite
Chemical
Formula
Fe2+2Al9O6(SiO4)4(O,OH)2[1]
Species
Silicates
Crystal
System
Monoclinic
Mohs
Scale
7
Color
Dark reddish brown to blackish brown, yellowish brown, rarely blue; pale golden yellow in thin section
Luster
Sub-Vitreous, Resinous