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Black Opal
Black Opal

Peridot
Peridot



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Black Opal
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Peridot

Black Opal and Peridot 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
1.97-2.221.54-1.55
Amber
1 7.18
1.5 Fracture
ConchoidalArthur Thomas, Gemstones (2009), ConchoidalArthur Thomas, Gemstones (2009)
Conchoidal
1.6 Cleavage
Not Available
Poor
1.7 Mohs Hardness
6-6.56.5-7
Amber
2 10
1.8 Chemical Composition
SiO 2 + H 2OUlrich Henn and Claudio C.
(Mg,Fe)2SiO4

Black Opal and Peridot Chemical Formula

While comparing Black Opal and Peridot 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 Peridot chemical formula.

  • Chemical formula of Black Opal- SiO 2 + H 2OUlrich Henn and Claudio C.
  • Chemical formula of Peridot- (Mg,Fe)2SiO4

Black Opal and Peridot Specific Gravity

Another important criteria for qualitative analysis of gemstones is Black Opal and Peridot Specific gravity. Specific gravity is the relative density of a gemstone compared with respect to density of water. Gemologists use Black Opal and Peridot Optical Properties during the identification of gemstone. Specific gravity of Black Opal is 1.54-1.55 whereas that of Peridot is 1.54-1.55.