Scientific Properties:
Stone Type/Family: A member of the Tourmaline family, Silicates class
Category: Silicate mineral group
Chemical formula: (Ca,K,Na,[])(Al,Fe,Li,Mg,Mn)3(Al,Cr, Fe,V)6
(BO3)3(Si,Al,B)6O18(OH,F)4
Crystal system: Trigonal
Cleavage: Indistinct
Fracture: Uneven, small conchoidal, brittle
Mohs scale hardness: 7-7.5 |
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