Ettringite and Bertrandite Physical Properties

Ettringite

Bertrandite

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1 Physical Properties

1.1 Tenacity

Not Available

1.2 Solubility

Partially soluble in water

Not Available

1.3 Durability

Not Available

1.4 Specific Gravity

1.772.59-2.60

1 7.18

1.5 Fracture

Not Available

Brittle, Metallic, Brittle, Metallic

1.6 Cleavage

Perfect on {10 1 0}

{001} Perfect, {110} Distinct, {101} Distinct

1.7 Mohs Hardness

2-2.56-7

2 10

1.8 Chemical Composition

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

Be 4Si 2O 7(OH) 2Anthony et al , Handbook of mineralogy (2001)

Ettringite and Bertrandite Chemical Formula

While comparing Ettringite and Bertrandite 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 Bertrandite chemical formula.

Chemical formula of Ettringite- Ca 6Al 2(SO 4) 3(OH) 12 26H 2OMichael OâDonoghue , Gems, Sixth Edition (2006)
Chemical formula of Bertrandite- Be 4Si 2O 7(OH) 2Anthony et al , Handbook of mineralogy (2001)

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Ettringite and Bertrandite Specific Gravity

Another important criteria for qualitative analysis of gemstones is Ettringite and Bertrandite Specific gravity. Specific gravity is the relative density of a gemstone compared with respect to density of water. Gemologists use Ettringite and Bertrandite Optical Properties during the identification of gemstone. Specific gravity of Ettringite is 2.59-2.60 whereas that of Bertrandite is 2.59-2.60.