Topaz and Bertrandite Physical Properties

Topaz

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

3.49-3.572.59-2.60

1 7.18

1.7 Fracture

Subconchoidal, Uneven, ConchoidalArthur Thomas, Gemstones (2009), Brittle

Brittle, Metallic, Brittle, Metallic

1.8 Cleavage

[001] Perfect

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

1.9 Mohs Hardness

86-7

2 10

1.13 Chemical Composition

Al₂SiO₄(F,OH)₂

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

Topaz and Bertrandite Chemical Formula

While comparing Topaz 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 Topaz and Bertrandite chemical formula.

Chemical formula of Topaz- Al₂SiO₄(F,OH)₂
Chemical formula of Bertrandite- Be 4Si 2O 7(OH) 2Anthony et al , Handbook of mineralogy (2001)

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Topaz and Bertrandite Specific Gravity

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