Biotite and Rock Crystal Physical Properties
Tenacity
Brittle
Not Available
Solubility
Not Available
Not Available
Durability
Not Available
Not Available
Specific Gravity
2.7-3.3
2.65
Fracture
Uneven, Even, Yellow, White
ConchoidalWalter Schumann, Gemstones of the world (2001), ConchoidalWalter Schumann, Gemstones of the world (2001)
Cleavage
Perfect on the {001}
Not Available
Chemical Composition
K(Mg,Fe++)3[AlSi3O10(OH,F)2
SiO 2Walter Schumann , Gemstones of the world (2001)
Biotite and Rock Crystal Chemical Formula
While comparing Biotite and Rock Crystal 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 Biotite and Rock Crystal chemical formula.
- Chemical formula of Biotite- K(Mg,Fe++)3[AlSi3O10(OH,F)2
- Chemical formula of Rock Crystal- SiO 2Walter Schumann , Gemstones of the world (2001)
Biotite and Rock Crystal Specific Gravity
Another important criteria for qualitative analysis of gemstones is Biotite and Rock Crystal Specific gravity. Specific gravity is the relative density of a gemstone compared with respect to density of water. Gemologists use Biotite and Rock Crystal Optical Properties during the identification of gemstone. Specific gravity of Biotite is 2.65 whereas that of Rock Crystal is 2.65.