Biotite and Cinnabar Physical Properties
Tenacity
Brittle
Slightly sectile
Solubility
Not Available
1.04 x 10−25 g per 100 ml water (Ksp at 25°C = 2 x 10−32)
Durability
Not Available
Not Available
Specific Gravity
2.7-3.3
2
Fracture
Uneven, Even, Yellow, White
Uneven, Uneven, Gemstones (2009), Brittle
Cleavage
Perfect on the {001}
Prismatic {10 1 0}, perfect
Mohs Hardness
2.5-3.0
2-2.5
Chemical Composition
K(Mg,Fe++)3[AlSi3O10(OH,F)2
HgSMichael OâDonoghue , Gems, Sixth Edition (2006) More from other references
Biotite and Cinnabar Chemical Formula
While comparing Biotite and Cinnabar 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 Cinnabar chemical formula.
- Chemical formula of Biotite- K(Mg,Fe++)3[AlSi3O10(OH,F)2
- Chemical formula of Cinnabar- HgSMichael OâDonoghue , Gems, Sixth Edition (2006) More from other references
Biotite and Cinnabar Specific Gravity
Another important criteria for qualitative analysis of gemstones is Biotite and Cinnabar Specific gravity. Specific gravity is the relative density of a gemstone compared with respect to density of water. Gemologists use Biotite and Cinnabar Optical Properties during the identification of gemstone. Specific gravity of Biotite is 2 whereas that of Cinnabar is 2.