Astrophyllite and Halite Physical Properties

Astrophyllite

Halite

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1 Physical Properties

1.1 Tenacity

Not Available

Brittle

1.2 Solubility

Not Available

Water-soluble

1.3 Durability

Not Available

1.4 Specific Gravity

3.2-3.42.17

1 7.18

1.5 Fracture

Uneven, Brittle, Metallic

Conchoidal, Brittle, Metallic

1.6 Cleavage

Perfect on [001] imperfect on [100]

Perfect {001}, three directions cubic

1.7 Mohs Hardness

32.0-2.5

2 10

1.8 Chemical Composition

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

NaCl

Astrophyllite and Halite Chemical Formula

While comparing Astrophyllite and Halite 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 Halite 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 Halite- NaCl

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Astrophyllite and Halite Specific Gravity

Another important criteria for qualitative analysis of gemstones is Astrophyllite and Halite Specific gravity. Specific gravity is the relative density of a gemstone compared with respect to density of water. Gemologists use Astrophyllite and Halite Optical Properties during the identification of gemstone. Specific gravity of Astrophyllite is 2.17 whereas that of Halite is 2.17.