Astrophyllite and Austinite Physical Properties

Astrophyllite

Austinite

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1 Physical Properties

1.1 Tenacity

Not Available

Brittle

1.2 Solubility

Not Available

Easily soluble in cold dilute HCl

1.3 Durability

Not Available

1.4 Specific Gravity

3.2-3.44.12

1 7.18

1.5 Fracture

Uneven, Brittle, Metallic

Brittle, Uneven, Brittle, Uneven

1.6 Cleavage

Perfect on [001] imperfect on [100]

Good in two directions parallel to the prism faces {110}

1.7 Mohs Hardness

34-4.5

2 10

1.8 Chemical Composition

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

CaZn(AsO4)(OH)

Astrophyllite and Austinite Chemical Formula

While comparing Astrophyllite and Austinite 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 Austinite 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 Austinite- CaZn(AsO4)(OH)

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Astrophyllite and Austinite Specific Gravity

Another important criteria for qualitative analysis of gemstones is Astrophyllite and Austinite Specific gravity. Specific gravity is the relative density of a gemstone compared with respect to density of water. Gemologists use Astrophyllite and Austinite Optical Properties during the identification of gemstone. Specific gravity of Astrophyllite is 4.12 whereas that of Austinite is 4.12.