Almandine and Calcite Physical Properties

Almandine

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

3.95-4.30

2.67-2.73

1.5 Fracture

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

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

1.6 Cleavage

none

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

1.7 Mohs Hardness

7-7.5

1.8 Chemical Composition

Fe 3Al 2(SiO 4) 3Arthur Thomas , Gemstones (2009)

CaCO 3Ulrich Henn and Claudio C.

Almandine and Calcite Chemical Formula

While comparing Almandine 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 Almandine and Calcite chemical formula.

Chemical formula of Almandine- Fe 3Al 2(SiO 4) 3Arthur Thomas , Gemstones (2009)
Chemical formula of Calcite- CaCO 3Ulrich Henn and Claudio C.

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Almandine and Calcite Specific Gravity

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