Goethite and Calcite Physical Properties

Goethite

Calcite

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1 Physical Properties

1.1 Tenacity

Not Available

Brittle

1.2 Solubility

HCl soluble

Soluble

1.3 Durability

Not Available

1.4 Specific Gravity

4.27-4.292.67-2.73

1 7.18

1.5 Fracture

Uneven, torn surfaces, (e.g. fractured metals)., Uneven, Gemstones (2009), torn surfaces, (e.g. fractured metals).

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

1.6 Cleavage

Perfect {010}

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

1.7 Mohs Hardness

5-5.53

2 10

1.8 Chemical Composition

FeO(OH)Arthur Thomas , Gemstones (2009)

CaCO 3Ulrich Henn and Claudio C.

Goethite and Calcite Chemical Formula

While comparing Goethite 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 Goethite and Calcite chemical formula.

Chemical formula of Goethite- FeO(OH)Arthur Thomas , Gemstones (2009)
Chemical formula of Calcite- CaCO 3Ulrich Henn and Claudio C.

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Goethite and Calcite Specific Gravity

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