Goethite and Anthophyllite Physical Properties

Goethite

Anthophyllite

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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

4.27-4.292.9-3.5

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, Brittle, Conchoidal, Brittle

1.6 Cleavage

Perfect {010}

{110} Perfect, {???} Distinct, {???} Distinct

1.7 Mohs Hardness

5-5.55.5-6

2 10

1.8 Chemical Composition

FeO(OH)Arthur Thomas , Gemstones (2009)

(Mg,Fe2+ ) 2(Mg,Fe2+ ) 5Si 8O 22(OH) 2Anthony et al , Handbook of mineralogy (2001)

Goethite and Anthophyllite Chemical Formula

While comparing Goethite and Anthophyllite 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 Anthophyllite chemical formula.

Chemical formula of Goethite- FeO(OH)Arthur Thomas , Gemstones (2009)
Chemical formula of Anthophyllite- (Mg,Fe2+ ) 2(Mg,Fe2+ ) 5Si 8O 22(OH) 2Anthony et al , Handbook of mineralogy (2001)

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Goethite and Anthophyllite Specific Gravity

Another important criteria for qualitative analysis of gemstones is Goethite and Anthophyllite Specific gravity. Specific gravity is the relative density of a gemstone compared with respect to density of water. Gemologists use Goethite and Anthophyllite Optical Properties during the identification of gemstone. Specific gravity of Goethite is 2.9-3.5 whereas that of Anthophyllite is 2.9-3.5.