Opal and Cinnabar Physical Properties
Tenacity
BrittleWalter Schumann
Slightly sectile
Solubility
hot salt water
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
1.98-2.25
2
Fracture
Conchoidal, Conchoidal, Gemstones of the world (2001) More from other references, Brittle
Uneven, Uneven, Gemstones (2009), Brittle
Cleavage
None
Prismatic {10 1 0}, perfect
Mohs Hardness
5-6.5
2-2.5
Chemical Composition
SiO2 · nH2O
HgSMichael OâDonoghue , Gems, Sixth Edition (2006) More from other references
Opal and Cinnabar Chemical Formula
While comparing Opal 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 Opal and Cinnabar chemical formula.
- Chemical formula of Opal- SiO2 · nH2O
- Chemical formula of Cinnabar- HgSMichael OâDonoghue , Gems, Sixth Edition (2006) More from other references
Opal and Cinnabar Specific Gravity
Another important criteria for qualitative analysis of gemstones is Opal and Cinnabar Specific gravity. Specific gravity is the relative density of a gemstone compared with respect to density of water. Gemologists use Opal and Cinnabar Optical Properties during the identification of gemstone. Specific gravity of Opal is 2 whereas that of Cinnabar is 2.