Cinnabar and Spinel Physical Properties
Tenacity
Slightly sectile
Not Available
Solubility
1.04 x 10−25 g per 100 ml water (Ksp at 25°C = 2 x 10−32)
none
Durability
Not Available
Not Available
Specific Gravity
2
3.64-3.66
Fracture
Uneven, Uneven, Gemstones (2009), Brittle
Conchoidal, Uneven, ConchoidalArthur Thomas, Gemstones (2009)
Cleavage
Prismatic {10 1 0}, perfect
None, but may exhibit slight parting
Chemical Composition
HgSMichael OâDonoghue , Gems, Sixth Edition (2006) More from other references
MgAl2O4
Cinnabar and Spinel Chemical Formula
While comparing Cinnabar and Spinel 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 Cinnabar and Spinel chemical formula.
- Chemical formula of Cinnabar- HgSMichael OâDonoghue , Gems, Sixth Edition (2006) More from other references
- Chemical formula of Spinel- MgAl2O4
Cinnabar and Spinel Specific Gravity
Another important criteria for qualitative analysis of gemstones is Cinnabar and Spinel Specific gravity. Specific gravity is the relative density of a gemstone compared with respect to density of water. Gemologists use Cinnabar and Spinel Optical Properties during the identification of gemstone. Specific gravity of Cinnabar is 3.64-3.66 whereas that of Spinel is 3.64-3.66.