Goethite and Marialite Physical Properties

Goethite

Marialite

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1 Physical Properties

1.1 Tenacity

Not Available

Brittle

1.2 Solubility

HCl soluble

Not Available

1.3 Durability

Not Available

1.4 Specific Gravity

4.27-4.292.50

1 7.18

1.5 Fracture

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

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

1.6 Cleavage

Perfect {010}

Distinct on {100} and {110}

1.7 Mohs Hardness

5-5.55.5-6

2 10

1.8 Chemical Composition

FeO(OH)Arthur Thomas , Gemstones (2009)

3NaAlSi 3O 8 · NaClAnthony et al , Handbook of mineralogy (2001)

Goethite and Marialite Chemical Formula

While comparing Goethite and Marialite 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 Marialite chemical formula.

Chemical formula of Goethite- FeO(OH)Arthur Thomas , Gemstones (2009)
Chemical formula of Marialite- 3NaAlSi 3O 8 · NaClAnthony et al , Handbook of mineralogy (2001)

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Goethite and Marialite Specific Gravity

Another important criteria for qualitative analysis of gemstones is Goethite and Marialite Specific gravity. Specific gravity is the relative density of a gemstone compared with respect to density of water. Gemologists use Goethite and Marialite Optical Properties during the identification of gemstone. Specific gravity of Goethite is 2.50 whereas that of Marialite is 2.50.