Afghanite and Bertrandite Physical Properties

Afghanite

Bertrandite

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1 Physical Properties

1.1 Tenacity

Not Available

1.2 Solubility

Not Available

1.3 Durability

Not Available

1.4 Specific Gravity

2.55-2.65

2.59-2.60

1.5 Fracture

Conchoidal, ConchoidalArthur Thomas, Gemstones (2009), Conchoidal, Brittle, Conchoidal, Brittle

Brittle, Metallic, Brittle, Metallic

1.6 Cleavage

Perfect {10 1 0}

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

1.7 Mohs Hardness

5.5-6

6-7

1.8 Chemical Composition

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

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

Afghanite and Bertrandite Chemical Formula

While comparing Afghanite 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 Afghanite and Bertrandite chemical formula.

Chemical formula of Afghanite- (Na,Ca,K) 8(Si,Al) 12O 24(SO 4,Cl,CO 3) 3(H 2O)Arthur Thomas , Gemstones (2009)
Chemical formula of Bertrandite- Be 4Si 2O 7(OH) 2Anthony et al , Handbook of mineralogy (2001)

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Afghanite and Bertrandite Specific Gravity

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