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Black Opal
Black Opal

Carnelian
Carnelian



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Black Opal
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Carnelian

Black Opal and Carnelian Physical Properties

1 Physical Properties
1.1 Tenacity
Not Available
Not Available
1.2 Solubility
Not Available
Not Available
1.3 Durability
Not Available
Not Available
1.4 Specific Gravity
1.97-2.222.58-2.64
Amber
1 7.18
1.5 Fracture
ConchoidalArthur Thomas, Gemstones (2009), ConchoidalArthur Thomas, Gemstones (2009)
Uneven, Splintery, Conchoidal, UnevenWalter Schumann, Gemstones of the world (2001)
1.6 Cleavage
Not Available
Absent
1.7 Mohs Hardness
6-6.56.5-7
Amber
2 10
1.8 Chemical Composition
SiO 2 + H 2OUlrich Henn and Claudio C.
SiO2

Black Opal and Carnelian Chemical Formula

While comparing Black Opal and Carnelian 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 Carnelian chemical formula.

  • Chemical formula of Black Opal- SiO 2 + H 2OUlrich Henn and Claudio C.
  • Chemical formula of Carnelian- SiO2

Black Opal and Carnelian Specific Gravity

Another important criteria for qualitative analysis of gemstones is Black Opal and Carnelian Specific gravity. Specific gravity is the relative density of a gemstone compared with respect to density of water. Gemologists use Black Opal and Carnelian Optical Properties during the identification of gemstone. Specific gravity of Black Opal is 2.58-2.64 whereas that of Carnelian is 2.58-2.64.