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Ettringite
Ettringite

Onyx
Onyx



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Ettringite
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Onyx

Ettringite and Onyx Physical Properties

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1 Physical Properties
1.1 Tenacity
Not Available
Not Available
1.2 Solubility
Partially soluble in water
Not Available
1.3 Durability
Not Available
Not Available
1.4 Specific Gravity
1.772.55-2.70
Amber
1 7.18
1.5 Fracture
Not Available
Not Available
1.6 Cleavage
Perfect on {10 1 0}
Indiscernible
1.7 Mohs Hardness
2-2.56.5-7
Amber
2 10
1.8 Chemical Composition
Ca 6Al 2(SO 4) 3(OH) 12 26H 2OMichael O’Donoghue , Gems, Sixth Edition (2006)
SiO2

Ettringite and Onyx Chemical Formula

While comparing Ettringite and Onyx 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 Ettringite and Onyx chemical formula.

  • Chemical formula of Ettringite- Ca 6Al 2(SO 4) 3(OH) 12 26H 2OMichael O’Donoghue , Gems, Sixth Edition (2006)
  • Chemical formula of Onyx- SiO2

Ettringite and Onyx Specific Gravity

Another important criteria for qualitative analysis of gemstones is Ettringite and Onyx Specific gravity. Specific gravity is the relative density of a gemstone compared with respect to density of water. Gemologists use Ettringite and Onyx Optical Properties during the identification of gemstone. Specific gravity of Ettringite is 2.55-2.70 whereas that of Onyx is 2.55-2.70.