Astrophyllite and Erythrite Physical Properties

Astrophyllite

Erythrite

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1 Physical Properties

1.1 Tenacity

Not Available

Sectile

1.2 Solubility

Not Available

1.3 Durability

Not Available

1.4 Specific Gravity

3.2-3.4

3.06

1.5 Fracture

Uneven, Brittle, Metallic

Sectile Curved shavings or scrapings produced by a knife blade, (e.g. graphite).

1.6 Cleavage

Perfect on [001] imperfect on [100]

Perfect on {010}; poor on {100} and { 1 02}.

1.7 Mohs Hardness

Not Available

1.8 Chemical Composition

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

Co3(AsO4)2•8(H2O)

Astrophyllite and Erythrite Chemical Formula

While comparing Astrophyllite and Erythrite 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 Astrophyllite and Erythrite chemical formula.

Chemical formula of Astrophyllite- (K,Na) 3(Fe2+ ,Mn) 7Ti 2Si 8O 24(O,OH) 7Anthony et al , Handbook of mineralogy (2001)
Chemical formula of Erythrite- Co3(AsO4)2•8(H2O)

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Astrophyllite and Erythrite Specific Gravity

Another important criteria for qualitative analysis of gemstones is Astrophyllite and Erythrite Specific gravity. Specific gravity is the relative density of a gemstone compared with respect to density of water. Gemologists use Astrophyllite and Erythrite Optical Properties during the identification of gemstone. Specific gravity of Astrophyllite is 3.06 whereas that of Erythrite is 3.06.