Minerals identify

Know how to recognize them

Staurolite

Nesosilicate

Staurolite is a reddish brown to black, mostly opaque, nesosilicate 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 and manganese substitute in the iron site and trivalent iron can substitute for aluminium.

Identification

Color of mineral

Red
Brown
Black
Yellow
Blue
Golden

Mohs scale ( mineral hardness )

7

Density ( specific gravity )

1.736
1.74
1.745

Luster ( interacts light )

Resinous
Vitreous

Crystal ( diaphaneity )

Monoclinic