Goethite and Sard Physical Properties

Goethite

Sard

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1 Physical Properties

1.1 Tenacity

Not Available

1.2 Solubility

HCl soluble

Not Available

1.3 Durability

Not Available

1.4 Specific Gravity

4.27-4.292.58-2.63

1 7.18

1.5 Fracture

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

ConchoidalArthur Thomas, Gemstones (2009), ConchoidalArthur Thomas, Gemstones (2009)

1.6 Cleavage

Perfect {010}

Not Available

1.7 Mohs Hardness

5-5.56.5-7

2 10

1.8 Chemical Composition

FeO(OH)Arthur Thomas , Gemstones (2009)

SiO 2Ulrich Henn and Claudio C.

Goethite and Sard Chemical Formula

While comparing Goethite and Sard 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 Sard chemical formula.

Chemical formula of Goethite- FeO(OH)Arthur Thomas , Gemstones (2009)
Chemical formula of Sard- SiO 2Ulrich Henn and Claudio C.

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Goethite and Sard Specific Gravity

Another important criteria for qualitative analysis of gemstones is Goethite and Sard Specific gravity. Specific gravity is the relative density of a gemstone compared with respect to density of water. Gemologists use Goethite and Sard Optical Properties during the identification of gemstone. Specific gravity of Goethite is 2.58-2.63 whereas that of Sard is 2.58-2.63.