Calcite and Goethite Physical Properties

Calcite

Goethite

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1 Physical Properties

1.1 Tenacity

Brittle

Not Available

1.2 Solubility

Soluble

HCl soluble

1.3 Durability

Not Available

1.4 Specific Gravity

2.67-2.734.27-4.29

1 7.18

1.5 Fracture

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

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

1.6 Cleavage

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

Perfect {010}

1.7 Mohs Hardness

35-5.5

2 10

1.8 Chemical Composition

CaCO 3Ulrich Henn and Claudio C.

FeO(OH)Arthur Thomas , Gemstones (2009)

Calcite and Goethite Chemical Formula

While comparing Calcite and Goethite 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 Goethite chemical formula.

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

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Calcite and Goethite Specific Gravity

Another important criteria for qualitative analysis of gemstones is Calcite and Goethite Specific gravity. Specific gravity is the relative density of a gemstone compared with respect to density of water. Gemologists use Calcite and Goethite Optical Properties during the identification of gemstone. Specific gravity of Calcite is 4.27-4.29 whereas that of Goethite is 4.27-4.29.