Sillimanite and Cobaltite Physical Properties

Sillimanite

Cobaltite

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1 Physical Properties

1.1 Tenacity

Tough

Not Available

1.2 Solubility

Not Available

1.3 Durability

Not Available

1.4 Specific Gravity

3.20-3.266.3

1 7.18

1.5 Fracture

Splintery

UnevenAnthony et al, Handbook of mineralogy (2001) More from other references, UnevenAnthony et al, Handbook of mineralogy (2001) More from other references, Brittle, Metallic

1.6 Cleavage

{010} perfect

{100} Good, {010} Good, {001} Good

1.7 Mohs Hardness

6-7.55.5

2 10

1.8 Chemical Composition

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

CoAsSAnthony et al , Handbook of mineralogy (2001)

Sillimanite and Cobaltite Chemical Formula

While comparing Sillimanite and Cobaltite 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 Cobaltite chemical formula.

Chemical formula of Sillimanite- Al 2SiO 5Michael OâDonoghue , Gems, Sixth Edition (2006)
Chemical formula of Cobaltite- CoAsSAnthony et al , Handbook of mineralogy (2001)

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Sillimanite and Cobaltite Specific Gravity

Another important criteria for qualitative analysis of gemstones is Sillimanite and Cobaltite Specific gravity. Specific gravity is the relative density of a gemstone compared with respect to density of water. Gemologists use Sillimanite and Cobaltite Optical Properties during the identification of gemstone. Specific gravity of Sillimanite is 6.3 whereas that of Cobaltite is 6.3.