Astrophyllite and Andradite Physical Properties

Astrophyllite

Andradite

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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

3.2-3.43.70-4.10

1 7.18

1.5 Fracture

Uneven, Brittle, Metallic

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

1.6 Cleavage

Perfect on [001] imperfect on [100]

none

1.7 Mohs Hardness

36.5-7

2 10

1.8 Chemical Composition

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

Ca 3Fe 2(SiO 4) 3Arthur Thomas , Gemstones (2009)

Astrophyllite and Andradite Chemical Formula

While comparing Astrophyllite and Andradite 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 Andradite 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 Andradite- Ca 3Fe 2(SiO 4) 3Arthur Thomas , Gemstones (2009)

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Astrophyllite and Andradite Specific Gravity

Another important criteria for qualitative analysis of gemstones is Astrophyllite and Andradite Specific gravity. Specific gravity is the relative density of a gemstone compared with respect to density of water. Gemologists use Astrophyllite and Andradite Optical Properties during the identification of gemstone. Specific gravity of Astrophyllite is 3.70-4.10 whereas that of Andradite is 3.70-4.10.