Astrophyllite and Gahnospinel Physical Properties

Astrophyllite

Gahnospinel

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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

3.2-3.43.65-4.55

1 7.18

1.5 Fracture

Uneven, Brittle, Metallic

ConchoidalArthur Thomas, Gemstones (2009)

1.6 Cleavage

Perfect on [001] imperfect on [100]

None, but may exhibit slight parting

1.7 Mohs Hardness

37.5-8

2 10

1.8 Chemical Composition

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

(Mg,Zn)Al 2O 4Gemdat.org , Management Team (2012)

Astrophyllite and Gahnospinel Chemical Formula

While comparing Astrophyllite and Gahnospinel 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 Gahnospinel 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 Gahnospinel- (Mg,Zn)Al 2O 4Gemdat.org , Management Team (2012)

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Astrophyllite and Gahnospinel Specific Gravity

Another important criteria for qualitative analysis of gemstones is Astrophyllite and Gahnospinel Specific gravity. Specific gravity is the relative density of a gemstone compared with respect to density of water. Gemologists use Astrophyllite and Gahnospinel Optical Properties during the identification of gemstone. Specific gravity of Astrophyllite is 3.65-4.55 whereas that of Gahnospinel is 3.65-4.55.