Zoisite and Astrophyllite Physical Properties

Zoisite

Astrophyllite

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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

3.20-3.50

3.2-3.4

1.5 Fracture

Uneven, Conchoidal, ConchoidalArthur Thomas, Gemstones (2009), Even

Uneven, Brittle, Metallic

1.6 Cleavage

Perfect {010} imperfect {100}

Perfect on [001] imperfect on [100]

1.7 Mohs Hardness

6-7

1.8 Chemical Composition

Ca₂Al₃(SiO₄)₃(OH)

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

Zoisite and Astrophyllite Chemical Formula

While comparing Zoisite and Astrophyllite 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 Zoisite and Astrophyllite chemical formula.

Chemical formula of Zoisite- Ca₂Al₃(SiO₄)₃(OH)
Chemical formula of Astrophyllite- (K,Na) 3(Fe2+ ,Mn) 7Ti 2Si 8O 24(O,OH) 7Anthony et al , Handbook of mineralogy (2001)

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Zoisite and Astrophyllite Specific Gravity

Another important criteria for qualitative analysis of gemstones is Zoisite and Astrophyllite Specific gravity. Specific gravity is the relative density of a gemstone compared with respect to density of water. Gemologists use Zoisite and Astrophyllite Optical Properties during the identification of gemstone. Specific gravity of Zoisite is 3.2-3.4 whereas that of Astrophyllite is 3.2-3.4.