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Staurolite
Faustite
Faustite and Staurolite Physical Properties


Physical Properties
Tenacity
Brittle  
-  
Solubility
-  
-  
Durability
-  
-  
Specific Gravity
3.7-3.8  
2.9  
Fracture
Subconchoidal, Conchoidal  
Conchoidal  
Cleavage
Distinct on {010}  
{???} Indistinct  
Mohs Hardness
7-7.5  
4.5  
Chemical Composition
(Fe,Mg,Zn) 2Al 9(Si,Al) 4O 22(OH) 2Ulrich Henn and Claudio C.  
(Zn,Cu)Al 6(PO 4) 4(OH) 8 · 4H 2OMichael O’Donoghue , Gems, Sixth Edition (2006)  
Optical Properties >>
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