Bertrandite and Afghanite Physical Properties

Bertrandite

Afghanite

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Physical Properties

Tenacity

Solubility

Durability

Specific Gravity

Fracture

Cleavage

Mohs Hardness

Chemical Composition

2.59-2.60

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

6-7

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

2.55-2.65

Conchoidal

Perfect {10 1 0}

5.5-6

(Na,Ca,K) 8(Si,Al) 12O 24(SO 4,Cl,CO 3) 3(H 2O)Arthur Thomas , Gemstones (2009)

Bertrandite and Afghanite Chemical Formula

While comparing Bertrandite and Afghanite 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 Bertrandite and Afghanite chemical formula.

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Bertrandite and Afghanite Specific Gravity

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