Sillimanite and Annabergite Physical Properties

Sillimanite

Annabergite

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1 Physical Properties

1.1 Tenacity

Tough

Sectile

1.2 Solubility

Not Available

1.3 Durability

Not Available

1.4 Specific Gravity

3.20-3.263.07

1 7.18

1.5 Fracture

Splintery

Brittle, Metallic, Brittle, Metallic, Brittle, Metallic

1.6 Cleavage

{010} perfect

Perfect on {010}, indistinct on {100} and {102}

1.7 Mohs Hardness

6-7.52

2 10

1.8 Chemical Composition

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

Ni3(AsO4)2•8(H2O)

Sillimanite and Annabergite Chemical Formula

While comparing Sillimanite and Annabergite 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 Sillimanite and Annabergite chemical formula.

Chemical formula of Sillimanite- Al 2SiO 5Michael OâDonoghue , Gems, Sixth Edition (2006)
Chemical formula of Annabergite- Ni3(AsO4)2•8(H2O)

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Sillimanite and Annabergite Specific Gravity

Another important criteria for qualitative analysis of gemstones is Sillimanite and Annabergite Specific gravity. Specific gravity is the relative density of a gemstone compared with respect to density of water. Gemologists use Sillimanite and Annabergite Optical Properties during the identification of gemstone. Specific gravity of Sillimanite is 3.07 whereas that of Annabergite is 3.07.