Calcite and Crystal Opal Physical Properties

Calcite

Crystal Opal

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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

2.67-2.73

1.97-2.22

1.5 Fracture

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

ConchoidalArthur Thomas, Gemstones (2009), ConchoidalArthur Thomas, Gemstones (2009)

1.6 Cleavage

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

Not Available

1.7 Mohs Hardness

5.5-6.5

1.8 Chemical Composition

CaCO 3Ulrich Henn and Claudio C.

SiO 2 + H 2OUlrich Henn and Claudio C.

Calcite and Crystal Opal Chemical Formula

While comparing Calcite and Crystal Opal 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 Crystal Opal chemical formula.

Chemical formula of Calcite- CaCO 3Ulrich Henn and Claudio C.
Chemical formula of Crystal Opal- SiO 2 + H 2OUlrich Henn and Claudio C.

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Calcite and Crystal Opal Specific Gravity

Another important criteria for qualitative analysis of gemstones is Calcite and Crystal Opal Specific gravity. Specific gravity is the relative density of a gemstone compared with respect to density of water. Gemologists use Calcite and Crystal Opal Optical Properties during the identification of gemstone. Specific gravity of Calcite is 1.97-2.22 whereas that of Crystal Opal is 1.97-2.22.