Annabergite and Sillimanite Physical Properties

Annabergite

Sillimanite

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1 Physical Properties

1.1 Tenacity

Sectile

Tough

1.2 Solubility

Not Available

1.3 Durability

Not Available

1.4 Specific Gravity

3.073.20-3.26

1 7.18

1.5 Fracture

Brittle, Metallic, Brittle, Metallic, Brittle, Metallic

Splintery

1.6 Cleavage

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

{010} perfect

1.7 Mohs Hardness

26-7.5

2 10

1.8 Chemical Composition

Ni3(AsO4)2•8(H2O)

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

Annabergite and Sillimanite Chemical Formula

While comparing Annabergite 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 Annabergite and Sillimanite chemical formula.

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

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Annabergite and Sillimanite Specific Gravity

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