Sapphire and Ettringite Physical Properties

Sapphire

Ettringite

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1 Physical Properties

1.1 Tenacity

Not Available

1.2 Solubility

insoluble

Partially soluble in water

1.3 Durability

Not Available

1.4 Specific Gravity

3.95-4.031.77

1 7.18

1.5 Fracture

Uneven, Uneven, Gems, Sixth Edition (2006)

Not Available

1.6 Cleavage

None, but may exhibit parting

Perfect on {10 1 0}

1.7 Mohs Hardness

92-2.5

2 10

1.8 Chemical Composition

Al ₂ O ₃

Ca 6Al 2(SO 4) 3(OH) 12 26H 2OMichael OâDonoghue , Gems, Sixth Edition (2006)

Sapphire and Ettringite Chemical Formula

While comparing Sapphire 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 Sapphire and Ettringite chemical formula.

Chemical formula of Sapphire- Al ₂ O ₃
Chemical formula of Ettringite- Ca 6Al 2(SO 4) 3(OH) 12 26H 2OMichael OâDonoghue , Gems, Sixth Edition (2006)

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Sapphire and Ettringite Specific Gravity

Another important criteria for qualitative analysis of gemstones is Sapphire and Ettringite Specific gravity. Specific gravity is the relative density of a gemstone compared with respect to density of water. Gemologists use Sapphire and Ettringite Optical Properties during the identification of gemstone. Specific gravity of Sapphire is 1.77 whereas that of Ettringite is 1.77.