Calcite and Sillimanite Physical Properties

Calcite

Sillimanite

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1 Physical Properties

1.1 Tenacity

Brittle

Tough

1.2 Solubility

Soluble

Not Available

1.3 Durability

Not Available

1.4 Specific Gravity

2.67-2.733.20-3.26

1 7.18

1.5 Fracture

Conchoidal, ConchoidalArthur Thomas, Gemstones (2009), ConchoidalArthur Thomas, Gemstones (2009), Brittle, Conchoidal

Splintery

1.6 Cleavage

Perfect on [10 1 1] three directions with angle of 74° 55

{010} perfect

1.7 Mohs Hardness

36-7.5

2 10

1.8 Chemical Composition

CaCO 3Ulrich Henn and Claudio C.

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

Calcite and Sillimanite Chemical Formula

While comparing Calcite 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 Calcite and Sillimanite chemical formula.

Chemical formula of Calcite- CaCO 3Ulrich Henn and Claudio C.
Chemical formula of Sillimanite- Al 2SiO 5Michael OâDonoghue , Gems, Sixth Edition (2006)

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Calcite and Sillimanite Specific Gravity

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