Common Opal and Cinnabar Physical Properties
Tenacity
Not Available
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
1.98-2.50
2
Fracture
Conchoidal, Conchoidal, Gemstones of the world (2001)
Uneven, Uneven, Gemstones (2009), Brittle
Cleavage
Not Available
Prismatic {10 1 0}, perfect
Mohs Hardness
5.5-6.5
2-2.5
Chemical Composition
SiO 2 · nH 2OWalter Schumann , Gemstones of the world (2001)
HgSMichael OâDonoghue , Gems, Sixth Edition (2006) More from other references
Common Opal and Cinnabar Chemical Formula
While comparing Common 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 Common Opal and Cinnabar chemical formula.
- Chemical formula of Common Opal- SiO 2 · nH 2OWalter Schumann , Gemstones of the world (2001)
- Chemical formula of Cinnabar- HgSMichael OâDonoghue , Gems, Sixth Edition (2006) More from other references
Common Opal and Cinnabar Specific Gravity
Another important criteria for qualitative analysis of gemstones is Common Opal and Cinnabar Specific gravity. Specific gravity is the relative density of a gemstone compared with respect to density of water. Gemologists use Common Opal and Cinnabar Optical Properties during the identification of gemstone. Specific gravity of Common Opal is 2 whereas that of Cinnabar is 2.