Black Opal and Diaspore Physical Properties
Tenacity
Not Available
Very brittle
Solubility
Not Available
insoluble
Durability
Not Available
Not Available
Specific Gravity
1.97-2.22
3.30-3.40
Fracture
ConchoidalArthur Thomas, Gemstones (2009), ConchoidalArthur Thomas, Gemstones (2009)
Conchoidal, Brittle, Conchoidal
Cleavage
Not Available
{010} perfect, {110} distinct, {100} in traces
Mohs Hardness
6-6.5
6.5-7
Chemical Composition
SiO 2 + H 2OUlrich Henn and Claudio C.
AlO(OH)Walter Schumann , Gemstones of the world (2001) More from other references
Black Opal and Diaspore Chemical Formula
While comparing Black Opal and Diaspore 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 Black Opal and Diaspore chemical formula.
- Chemical formula of Black Opal- SiO 2 + H 2OUlrich Henn and Claudio C.
- Chemical formula of Diaspore- AlO(OH)Walter Schumann , Gemstones of the world (2001) More from other references
Black Opal and Diaspore Specific Gravity
Another important criteria for qualitative analysis of gemstones is Black Opal and Diaspore Specific gravity. Specific gravity is the relative density of a gemstone compared with respect to density of water. Gemologists use Black Opal and Diaspore Optical Properties during the identification of gemstone. Specific gravity of Black Opal is 3.30-3.40 whereas that of Diaspore is 3.30-3.40.