Astrophyllite and Prehnite Physical Properties

Astrophyllite

Prehnite

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1 Physical Properties

1.1 Tenacity

Not Available

Brittle

1.2 Solubility

Not Available

1.3 Durability

Not Available

1.4 Specific Gravity

3.2-3.42.80-2.95

1 7.18

1.5 Fracture

Uneven, Brittle, Metallic

Uneven, Yellow, White, UnevenWalter Schumann, Gemstones of the world (2001) More from other references, Brittle, Metallic

1.6 Cleavage

Perfect on [001] imperfect on [100]

Distinct on [001]

1.7 Mohs Hardness

36-6.5

2 10

1.8 Chemical Composition

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

Ca₂Al₂Si₃O₁₂(OH)

Astrophyllite and Prehnite Chemical Formula

While comparing Astrophyllite and Prehnite 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 Prehnite 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 Prehnite- Ca₂Al₂Si₃O₁₂(OH)

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Astrophyllite and Prehnite Specific Gravity

Another important criteria for qualitative analysis of gemstones is Astrophyllite and Prehnite Specific gravity. Specific gravity is the relative density of a gemstone compared with respect to density of water. Gemologists use Astrophyllite and Prehnite Optical Properties during the identification of gemstone. Specific gravity of Astrophyllite is 2.80-2.95 whereas that of Prehnite is 2.80-2.95.