Grandidierite and Astrophyllite Physical Properties

Grandidierite

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

2.85-3.003.2-3.4

1 7.18

1.5 Fracture

Brittle, UnevenArthur Thomas, Gemstones (2009), Brittle, Uneven

Uneven, Brittle, Metallic

1.6 Cleavage

Perfect

Perfect on [001] imperfect on [100]

1.7 Mohs Hardness

7.53

2 10

1.8 Chemical Composition

(Mg,Fe)Al 3(BO 4)(SiO 4)OUlrich Henn and Claudio C.

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

Grandidierite and Astrophyllite Chemical Formula

While comparing Grandidierite 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 Grandidierite and Astrophyllite chemical formula.

Chemical formula of Grandidierite- (Mg,Fe)Al 3(BO 4)(SiO 4)OUlrich Henn and Claudio C.
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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Grandidierite and Astrophyllite Specific Gravity

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