Calcite and Aragonite Physical Properties

Calcite

Aragonite

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1 Physical Properties

1.1 Tenacity

Brittle

1.2 Solubility

Soluble

Dilute acid

1.3 Durability

Not Available

1.4 Specific Gravity

2.67-2.732.93-2.96

1 7.18

1.5 Fracture

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

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

1.6 Cleavage

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

Distinct on {010}, imperfect {110} and {011}

1.7 Mohs Hardness

33.5-4

2 10

1.8 Chemical Composition

CaCO 3Ulrich Henn and Claudio C.

CaCO 3Michael OâDonoghue , Gems, Sixth Edition (2006) More from other references

Calcite and Aragonite Chemical Formula

While comparing Calcite and Aragonite 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 Aragonite chemical formula.

Chemical formula of Calcite- CaCO 3Ulrich Henn and Claudio C.
Chemical formula of Aragonite- CaCO 3Michael OâDonoghue , Gems, Sixth Edition (2006) More from other references

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Calcite and Aragonite Specific Gravity

Another important criteria for qualitative analysis of gemstones is Calcite and Aragonite Specific gravity. Specific gravity is the relative density of a gemstone compared with respect to density of water. Gemologists use Calcite and Aragonite Optical Properties during the identification of gemstone. Specific gravity of Calcite is 2.93-2.96 whereas that of Aragonite is 2.93-2.96.