Opal and Powellite Physical Properties
Tenacity
BrittleWalter Schumann
Not Available
Solubility
hot salt water
Not Available
Durability
Not Available
Not Available
Specific Gravity
1.98-2.25
4.23
Fracture
Conchoidal, Conchoidal, Gemstones of the world (2001) More from other references, Brittle
UnevenAnthony et al, Handbook of mineralogy (2001), UnevenAnthony et al, Handbook of mineralogy (2001), Brittle, Conchoidal
Cleavage
None
{111} Distinct
Mohs Hardness
5-6.5
3.5-4
Chemical Composition
SiO2 · nH2O
CaMoO 4Michael OâDonoghue , Gems, Sixth Edition (2006)
Opal and Powellite Chemical Formula
While comparing Opal and Powellite 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 Powellite chemical formula.
- Chemical formula of Opal- SiO2 · nH2O
- Chemical formula of Powellite- CaMoO 4Michael OâDonoghue , Gems, Sixth Edition (2006)
Opal and Powellite Specific Gravity
Another important criteria for qualitative analysis of gemstones is Opal and Powellite Specific gravity. Specific gravity is the relative density of a gemstone compared with respect to density of water. Gemologists use Opal and Powellite Optical Properties during the identification of gemstone. Specific gravity of Opal is 4.23 whereas that of Powellite is 4.23.