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Ettringite
Ettringite

Selenite
Selenite



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Ettringite
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Ettringite and Selenite Physical Properties

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
1.77
Not Available
1.5 Fracture
Not Available
Not Available
1.6 Cleavage
Perfect on {10 1 0}
Not Available
1.7 Mohs Hardness
2-2.5
2
1.8 Chemical Composition
Ca 6Al 2(SO 4) 3(OH) 12 26H 2OMichael O’Donoghue , Gems, Sixth Edition (2006)
Not Available

Ettringite and Selenite Chemical Formula

While comparing Ettringite and Selenite 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 Selenite chemical formula.

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

Another important criteria for qualitative analysis of gemstones is Ettringite and Selenite Specific gravity. Specific gravity is the relative density of a gemstone compared with respect to density of water. Gemologists use Ettringite and Selenite Optical Properties during the identification of gemstone. Specific gravity of Ettringite is Not Available whereas that of Selenite is Not Available.