Calcite and Hercynite Physical Properties

Calcite

Hercynite

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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

2.67-2.734.39

1 7.18

1.5 Fracture

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

ConchoidalGemdat.org, Uneven

1.6 Cleavage

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

{111} Indistinct, {111} Indistinct, {111} Indistinct

1.7 Mohs Hardness

37.5-8

2 10

1.8 Chemical Composition

CaCO 3Ulrich Henn and Claudio C.

Fe2+ Al 2O 4Gemdat.org , Management Team (2012)

Calcite and Hercynite Chemical Formula

While comparing Calcite and Hercynite 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 Hercynite chemical formula.

Chemical formula of Calcite- CaCO 3Ulrich Henn and Claudio C.
Chemical formula of Hercynite- Fe2+ Al 2O 4Gemdat.org , Management Team (2012)

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Calcite and Hercynite Specific Gravity

Another important criteria for qualitative analysis of gemstones is Calcite and Hercynite Specific gravity. Specific gravity is the relative density of a gemstone compared with respect to density of water. Gemologists use Calcite and Hercynite Optical Properties during the identification of gemstone. Specific gravity of Calcite is 4.39 whereas that of Hercynite is 4.39.