Calcite and Achroite Physical Properties

Calcite

Achroite

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1 Physical Properties

1.1 Tenacity

Brittle

Not Available

1.2 Solubility

Soluble

Not Available

1.3 Durability

Not Available

1.4 Specific Gravity

2.67-2.732.90-3.40

1 7.18

1.5 Fracture

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

Uneven, Uneven, ConchoidalWalter Schumann, Gemstones of the world (2001)

1.6 Cleavage

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

Not Available

1.7 Mohs Hardness

37-7.5

2 10

1.8 Chemical Composition

CaCO 3Ulrich Henn and Claudio C.

Na(Li 1.5Al 1.5)Al 6(Si 6O 18)(BO 3) 3(OH) 3(OH)Gemdat.org , Management Team (2012) Formula given for elbaite.

Calcite and Achroite Chemical Formula

While comparing Calcite and Achroite 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 Achroite chemical formula.

Chemical formula of Calcite- CaCO 3Ulrich Henn and Claudio C.
Chemical formula of Achroite- Na(Li 1.5Al 1.5)Al 6(Si 6O 18)(BO 3) 3(OH) 3(OH)Gemdat.org , Management Team (2012) Formula given for elbaite.

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Calcite and Achroite Specific Gravity

Another important criteria for qualitative analysis of gemstones is Calcite and Achroite Specific gravity. Specific gravity is the relative density of a gemstone compared with respect to density of water. Gemologists use Calcite and Achroite Optical Properties during the identification of gemstone. Specific gravity of Calcite is 2.90-3.40 whereas that of Achroite is 2.90-3.40.