Adamite and Sillimanite Physical Properties

Adamite

Sillimanite

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1 Physical Properties

1.1 Tenacity

Brittle

Tough

1.2 Solubility

Not Available

1.3 Durability

Not Available

1.4 Specific Gravity

4.32-4.48

3.20-3.26

1.5 Fracture

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

Splintery

1.6 Cleavage

{101}, good; {010}, poor

{010} perfect

1.7 Mohs Hardness

3.5

6-7.5

1.8 Chemical Composition

Zn 2(AsO 4)(OH)Michael OâDonoghue , Gems, Sixth edition (2006)

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

Adamite and Sillimanite Chemical Formula

While comparing Adamite 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 Adamite and Sillimanite chemical formula.

Chemical formula of Adamite- Zn 2(AsO 4)(OH)Michael OâDonoghue , Gems, Sixth edition (2006)
Chemical formula of Sillimanite- Al 2SiO 5Michael OâDonoghue , Gems, Sixth Edition (2006)

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Adamite and Sillimanite Specific Gravity

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