Calcite and Almandine Physical Properties

Calcite

Almandine

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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

2.67-2.733.95-4.30

1 7.18

1.5 Fracture

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

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

1.6 Cleavage

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

none

1.7 Mohs Hardness

37-7.5

2 10

1.8 Chemical Composition

CaCO 3Ulrich Henn and Claudio C.

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

Calcite and Almandine Chemical Formula

While comparing Calcite and Almandine 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 Almandine chemical formula.

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

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Calcite and Almandine Specific Gravity

Another important criteria for qualitative analysis of gemstones is Calcite and Almandine Specific gravity. Specific gravity is the relative density of a gemstone compared with respect to density of water. Gemologists use Calcite and Almandine Optical Properties during the identification of gemstone. Specific gravity of Calcite is 3.95-4.30 whereas that of Almandine is 3.95-4.30.