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