Bertrandite and Sillimanite Physical Properties

Bertrandite

Sillimanite

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1 Physical Properties

1.1 Tenacity

Not Available

Tough

1.2 Solubility

Not Available

1.3 Durability

Not Available

1.4 Specific Gravity

2.59-2.603.20-3.26

1 7.18

1.5 Fracture

Brittle, Metallic, Brittle, Metallic

Splintery

1.6 Cleavage

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

{010} perfect

1.7 Mohs Hardness

6-76-7.5

2 10

1.8 Chemical Composition

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

Al 2SiO 5Michael OâDonoghue , Gems, Sixth Edition (2006)

Bertrandite and Sillimanite Chemical Formula

While comparing Bertrandite and Sillimanite 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 Sillimanite chemical formula.

Chemical formula of Bertrandite- Be 4Si 2O 7(OH) 2Anthony et al , Handbook of mineralogy (2001)
Chemical formula of Sillimanite- Al 2SiO 5Michael OâDonoghue , Gems, Sixth Edition (2006)

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Bertrandite and Sillimanite Specific Gravity

Another important criteria for qualitative analysis of gemstones is Bertrandite and Sillimanite Specific gravity. Specific gravity is the relative density of a gemstone compared with respect to density of water. Gemologists use Bertrandite and Sillimanite Optical Properties during the identification of gemstone. Specific gravity of Bertrandite is 3.20-3.26 whereas that of Sillimanite is 3.20-3.26.