Astrophyllite and Malachite Physical Properties

Astrophyllite

Malachite

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1 Physical Properties

1.1 Tenacity

Not Available

1.2 Solubility

Not Available

1.3 Durability

Not Available

1.4 Specific Gravity

3.2-3.43.25-4.10

1 7.18

1.5 Fracture

Uneven, Brittle, Metallic

Conchoidal, Conchoidal, Gemstones (2009), Uneven

1.6 Cleavage

Perfect on [001] imperfect on [100]

Perfect on { 2 01} fair on {010}

1.7 Mohs Hardness

33.5-4

2 10

1.8 Chemical Composition

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

Cu₂CO₃(OH)₂

Astrophyllite and Malachite Chemical Formula

While comparing Astrophyllite and Malachite 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 Malachite 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 Malachite- Cu₂CO₃(OH)₂

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Astrophyllite and Malachite Specific Gravity

Another important criteria for qualitative analysis of gemstones is Astrophyllite and Malachite Specific gravity. Specific gravity is the relative density of a gemstone compared with respect to density of water. Gemologists use Astrophyllite and Malachite Optical Properties during the identification of gemstone. Specific gravity of Astrophyllite is 3.25-4.10 whereas that of Malachite is 3.25-4.10.