Goethite and Astrophyllite Physical Properties

Goethite

Astrophyllite

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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

4.27-4.293.2-3.4

1 7.18

1.5 Fracture

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

Uneven, Brittle, Metallic

1.6 Cleavage

Perfect {010}

Perfect on [001] imperfect on [100]

1.7 Mohs Hardness

5-5.53

2 10

1.8 Chemical Composition

FeO(OH)Arthur Thomas , Gemstones (2009)

(K,Na) 3(Fe2+ ,Mn) 7Ti 2Si 8O 24(O,OH) 7Anthony et al , Handbook of mineralogy (2001)

Goethite and Astrophyllite Chemical Formula

While comparing Goethite and Astrophyllite 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 Astrophyllite chemical formula.

Chemical formula of Goethite- FeO(OH)Arthur Thomas , Gemstones (2009)
Chemical formula of Astrophyllite- (K,Na) 3(Fe2+ ,Mn) 7Ti 2Si 8O 24(O,OH) 7Anthony et al , Handbook of mineralogy (2001)

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Goethite and Astrophyllite Specific Gravity

Another important criteria for qualitative analysis of gemstones is Goethite and Astrophyllite Specific gravity. Specific gravity is the relative density of a gemstone compared with respect to density of water. Gemologists use Goethite and Astrophyllite Optical Properties during the identification of gemstone. Specific gravity of Goethite is 3.2-3.4 whereas that of Astrophyllite is 3.2-3.4.