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Spinel
Spinel

Ettringite
Ettringite



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Spinel
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Ettringite

Spinel and Ettringite Physical Properties

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Physical Properties

Tenacity

Solubility

Durability

Specific Gravity

Fracture

Cleavage

Mohs Hardness

Chemical Composition

 
-
-
-
3.64-3.66
Conchoidal, Uneven
None, but may exhibit slight parting
8
MgAl2O4
 
-
Partially soluble in water
-
1.77
-
Perfect on {10 1 0}
2-2.5
Ca 6Al 2(SO 4) 3(OH) 12 26H 2OMichael O’Donoghue , Gems, Sixth Edition (2006)

Spinel and Ettringite Chemical Formula

While comparing Spinel and Ettringite 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 Spinel and Ettringite chemical formula.

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Spinel and Ettringite Specific Gravity

Another important criteria for qualitative analysis of gemstones is Spinel and Ettringite Specific gravity. Specific gravity is the relative density of a gemstone compared with respect to density of water. Gemologists use Spinel Vs Ettringite during the identification of gemstone. Specific gravity of Spinel is whereas that of Ettringite is .