Faustite and Biotite Physical Properties
Tenacity
Not Available
Brittle
Solubility
Not Available
Not Available
Durability
Not Available
Not Available
Specific Gravity
2.9
2.7-3.3
Fracture
Conchoidal, ConchoidalAnthony et al, Conchoidal, Brittle, Conchoidal
Uneven, Even, Yellow, White
Cleavage
{???} Indistinct
Perfect on the {001}
Mohs Hardness
4.5
2.5-3.0
Chemical Composition
(Zn,Cu)Al 6(PO 4) 4(OH) 8 · 4H 2OMichael OâDonoghue , Gems, Sixth Edition (2006)
K(Mg,Fe++)3[AlSi3O10(OH,F)2
Faustite and Biotite Chemical Formula
While comparing Faustite and Biotite physical properties, the important data you should know is its chemical composition. Since chemical formula defines the molecular structure of the crystal, most of the physical properties like color, tenacity, solubility are governed by Faustite and Biotite chemical formula.
- Chemical formula of Faustite- (Zn,Cu)Al 6(PO 4) 4(OH) 8 · 4H 2OMichael OâDonoghue , Gems, Sixth Edition (2006)
- Chemical formula of Biotite- K(Mg,Fe++)3[AlSi3O10(OH,F)2
Faustite and Biotite Specific Gravity
Another important criteria for qualitative analysis of gemstones is Faustite and Biotite Specific gravity. Specific gravity is the relative density of a gemstone compared with respect to density of water. Gemologists use Faustite and Biotite Optical Properties during the identification of gemstone. Specific gravity of Faustite is 2.7-3.3 whereas that of Biotite is 2.7-3.3.