Calcite and Poudretteite Physical Properties

Calcite

Poudretteite

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1 Physical Properties

1.1 Tenacity

Brittle

1.2 Solubility

Soluble

Not Available

1.3 Durability

Not Available

1.4 Specific Gravity

2.67-2.732.51-2.53

1 7.18

1.5 Fracture

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

Conchoidal, Splintery

1.6 Cleavage

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

None

1.7 Mohs Hardness

2 10

1.8 Chemical Composition

CaCO 3Ulrich Henn and Claudio C.

KNa 2B 3Si 12O 30Michael OâDonoghue , Gems, Sixth Edition (2006)

Calcite and Poudretteite Chemical Formula

While comparing Calcite and Poudretteite 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 Poudretteite chemical formula.

Chemical formula of Calcite- CaCO 3Ulrich Henn and Claudio C.
Chemical formula of Poudretteite- KNa 2B 3Si 12O 30Michael OâDonoghue , Gems, Sixth Edition (2006)

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Calcite and Poudretteite Specific Gravity

Another important criteria for qualitative analysis of gemstones is Calcite and Poudretteite Specific gravity. Specific gravity is the relative density of a gemstone compared with respect to density of water. Gemologists use Calcite and Poudretteite Optical Properties during the identification of gemstone. Specific gravity of Calcite is 2.51-2.53 whereas that of Poudretteite is 2.51-2.53.