Goethite and Diaspore Physical Properties

Goethite

Diaspore

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1 Physical Properties

1.1 Tenacity

Not Available

Very brittle

1.2 Solubility

HCl soluble

insoluble

1.3 Durability

Not Available

1.4 Specific Gravity

4.27-4.293.30-3.40

1 7.18

1.5 Fracture

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

Conchoidal, Brittle, Conchoidal

1.6 Cleavage

Perfect {010}

{010} perfect, {110} distinct, {100} in traces

1.7 Mohs Hardness

5-5.56.5-7

2 10

1.8 Chemical Composition

FeO(OH)Arthur Thomas , Gemstones (2009)

AlO(OH)Walter Schumann , Gemstones of the world (2001) More from other references

Goethite and Diaspore Chemical Formula

While comparing Goethite and Diaspore 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 Diaspore chemical formula.

Chemical formula of Goethite- FeO(OH)Arthur Thomas , Gemstones (2009)
Chemical formula of Diaspore- AlO(OH)Walter Schumann , Gemstones of the world (2001) More from other references

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Goethite and Diaspore Specific Gravity

Another important criteria for qualitative analysis of gemstones is Goethite and Diaspore Specific gravity. Specific gravity is the relative density of a gemstone compared with respect to density of water. Gemologists use Goethite and Diaspore Optical Properties during the identification of gemstone. Specific gravity of Goethite is 3.30-3.40 whereas that of Diaspore is 3.30-3.40.