Calcite and Prehnite Physical Properties

Calcite

Prehnite

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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

2.67-2.73

2.80-2.95

1.5 Fracture

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

Uneven, Yellow, White, UnevenWalter Schumann, Gemstones of the world (2001) More from other references, Brittle, Metallic

1.6 Cleavage

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

Distinct on [001]

1.7 Mohs Hardness

6-6.5

1.8 Chemical Composition

CaCO 3Ulrich Henn and Claudio C.

Ca₂Al₂Si₃O₁₂(OH)

Calcite and Prehnite Chemical Formula

While comparing Calcite and Prehnite 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 Prehnite chemical formula.

Chemical formula of Calcite- CaCO 3Ulrich Henn and Claudio C.
Chemical formula of Prehnite- Ca₂Al₂Si₃O₁₂(OH)

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Calcite and Prehnite Specific Gravity

Another important criteria for qualitative analysis of gemstones is Calcite and Prehnite Specific gravity. Specific gravity is the relative density of a gemstone compared with respect to density of water. Gemologists use Calcite and Prehnite Optical Properties during the identification of gemstone. Specific gravity of Calcite is 2.80-2.95 whereas that of Prehnite is 2.80-2.95.