Astrophyllite and Spinel Physical Properties

Astrophyllite

Spinel

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1 Physical Properties

1.1 Tenacity

Not Available

1.2 Solubility

Not Available

none

1.3 Durability

Not Available

1.4 Specific Gravity

3.2-3.43.64-3.66

1 7.18

1.5 Fracture

Uneven, Brittle, Metallic

Conchoidal, Uneven, ConchoidalArthur Thomas, Gemstones (2009)

1.6 Cleavage

Perfect on [001] imperfect on [100]

None, but may exhibit slight parting

1.7 Mohs Hardness

2 10

1.8 Chemical Composition

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

MgAl₂O₄

Astrophyllite and Spinel Chemical Formula

While comparing Astrophyllite and Spinel 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 Spinel 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 Spinel- MgAl₂O₄

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Astrophyllite and Spinel Specific Gravity

Another important criteria for qualitative analysis of gemstones is Astrophyllite and Spinel Specific gravity. Specific gravity is the relative density of a gemstone compared with respect to density of water. Gemologists use Astrophyllite and Spinel Optical Properties during the identification of gemstone. Specific gravity of Astrophyllite is 3.64-3.66 whereas that of Spinel is 3.64-3.66.