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Collection: Staurolite

Formula: Fe2+2Al9Si4O23(OH)
The formula can also be considered as alternating layers of kyanite and oxide, and so can be recast as: 4Al2O[SiO4].AlFe2+2O4H
Colour: Dark brown, brownish-black, red-brown
Luster: Sub-Vitreous, Resinous
Hardness: 7 - 7½
Specific Gravity: 3.74 - 3.83
Crystal System: Monoclinic
Member of: Staurolite Group
1 product
  • Staurolite Specimen. 13g
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