Agate Opal and Calcite Physical Properties

Agate Opal

Calcite

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1 Physical Properties

1.1 Tenacity

Not Available

Brittle

1.2 Solubility

Not Available

Soluble

1.3 Durability

Not Available

1.4 Specific Gravity

1.98-2.502.67-2.73

1 7.18

1.5 Fracture

Conchoidal, Conchoidal, Gemstones of the world (2001)

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

1.6 Cleavage

Not Available

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

1.7 Mohs Hardness

5.5-6.53

2 10

1.8 Chemical Composition

SiO 2 · nH 2OWalter Schumann , Gemstones of the world (2001)

CaCO 3Ulrich Henn and Claudio C.

Agate Opal and Calcite Chemical Formula

While comparing Agate Opal and Calcite 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 Agate Opal and Calcite chemical formula.

Chemical formula of Agate Opal- SiO 2 · nH 2OWalter Schumann , Gemstones of the world (2001)
Chemical formula of Calcite- CaCO 3Ulrich Henn and Claudio C.

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Agate Opal Vs Anorthite

Agate Opal Vs Anorthoclase

Agate Opal Vs Anthophyllite

Agate Opal and Calcite Specific Gravity

Another important criteria for qualitative analysis of gemstones is Agate Opal and Calcite Specific gravity. Specific gravity is the relative density of a gemstone compared with respect to density of water. Gemologists use Agate Opal and Calcite Optical Properties during the identification of gemstone. Specific gravity of Agate Opal is 2.67-2.73 whereas that of Calcite is 2.67-2.73.