Goethite and Forsterite Physical Properties

Goethite

Forsterite

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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

4.27-4.293.23-3.26

1 7.18

1.5 Fracture

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

Conchoidal, ConchoidalAnthony et al, Handbook of mineralogy (2001), Conchoidal, Brittle

1.6 Cleavage

Perfect {010}

Perfect on {010} imperfect on {100}

1.7 Mohs Hardness

5-5.56.5-7

2 10

1.8 Chemical Composition

FeO(OH)Arthur Thomas , Gemstones (2009)

Mg 2SiO 4Michael OâDonoghue , Gems, Sixth Edition (2006)

Goethite and Forsterite Chemical Formula

While comparing Goethite and Forsterite 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 Forsterite chemical formula.

Chemical formula of Goethite- FeO(OH)Arthur Thomas , Gemstones (2009)
Chemical formula of Forsterite- Mg 2SiO 4Michael OâDonoghue , Gems, Sixth Edition (2006)

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Goethite and Forsterite Specific Gravity

Another important criteria for qualitative analysis of gemstones is Goethite and Forsterite Specific gravity. Specific gravity is the relative density of a gemstone compared with respect to density of water. Gemologists use Goethite and Forsterite Optical Properties during the identification of gemstone. Specific gravity of Goethite is 3.23-3.26 whereas that of Forsterite is 3.23-3.26.