Astrophyllite and Fluorite Physical Properties

Astrophyllite

Fluorite

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Physical Properties

Tenacity

Brittle

Solubility

slightly water soluble and in hot hydrochloric acid

Durability

Specific Gravity

3.2-3.43.00-3.25

1 7.18

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Fracture

Uneven

Subconchoidal, Uneven, ConchoidalWalter Schumann

Cleavage

Perfect on [001] imperfect on [100]

Octahedral, perfect on {111}, parting on {011}

Mohs Hardness

2 10

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Chemical Composition

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

CaF₂

Astrophyllite and Fluorite Chemical Formula

While comparing Astrophyllite and Fluorite 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 Fluorite 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 Fluorite- CaF₂

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Astrophyllite and Fluorite Specific Gravity

Another important criteria for qualitative analysis of gemstones is Astrophyllite and Fluorite Specific gravity. Specific gravity is the relative density of a gemstone compared with respect to density of water. Gemologists use Astrophyllite and Fluorite Optical Properties during the identification of gemstone. Specific gravity of Astrophyllite is 3.00-3.25 whereas that of Fluorite is 3.00-3.25.