Goethite and Mellite Physical Properties

Goethite

Mellite

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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

4.27-4.291.58-1.60

1 7.18

1.5 Fracture

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

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

1.6 Cleavage

Perfect {010}

{011} Imperfect

1.7 Mohs Hardness

5-5.52

2 10

1.8 Chemical Composition

FeO(OH)Arthur Thomas , Gemstones (2009)

Al 2(Cl 2O 12) · 18H 2OUlrich Henn and Claudio C.

Goethite and Mellite Chemical Formula

While comparing Goethite and Mellite 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 Mellite chemical formula.

Chemical formula of Goethite- FeO(OH)Arthur Thomas , Gemstones (2009)
Chemical formula of Mellite- Al 2(Cl 2O 12) · 18H 2OUlrich Henn and Claudio C.

Compare Brown Gemstones

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Goethite and Mellite Specific Gravity

Another important criteria for qualitative analysis of gemstones is Goethite and Mellite Specific gravity. Specific gravity is the relative density of a gemstone compared with respect to density of water. Gemologists use Goethite and Mellite Optical Properties during the identification of gemstone. Specific gravity of Goethite is 1.58-1.60 whereas that of Mellite is 1.58-1.60.