Spinel and Astrophyllite Physical Properties

Spinel

Astrophyllite

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1 Physical Properties

1.1 Tenacity

Not Available

1.2 Solubility

none

Not Available

1.3 Durability

Not Available

1.4 Specific Gravity

3.64-3.663.2-3.4

1 7.18

1.5 Fracture

Conchoidal, Uneven, ConchoidalArthur Thomas, Gemstones (2009)

Uneven, Brittle, Metallic

1.6 Cleavage

None, but may exhibit slight parting

Perfect on [001] imperfect on [100]

1.7 Mohs Hardness

2 10

1.8 Chemical Composition

MgAl₂O₄

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

Spinel and Astrophyllite Chemical Formula

While comparing Spinel 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 Spinel and Astrophyllite chemical formula.

Chemical formula of Spinel- MgAl₂O₄
Chemical formula of Astrophyllite- (K,Na) 3(Fe2+ ,Mn) 7Ti 2Si 8O 24(O,OH) 7Anthony et al , Handbook of mineralogy (2001)

Compare Gems for Scorpio

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Spinel and Astrophyllite Specific Gravity

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