Alunite and Gahnospinel Physical Properties

Alunite

Gahnospinel

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1 Physical Properties

1.1 Tenacity

Brittle

Not Available

1.2 Solubility

Soluble

Not Available

1.3 Durability

Not Available

1.4 Specific Gravity

2.6-2.93.65-4.55

1 7.18

1.5 Fracture

Conchoidal, Uneven

ConchoidalArthur Thomas, Gemstones (2009)

1.6 Cleavage

On {0001}, perfect

None, but may exhibit slight parting

1.7 Mohs Hardness

3.5-47.5-8

2 10

2.5 Chemical Composition

KAl3(SO4)2(OH)6

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

Alunite and Gahnospinel Chemical Formula

While comparing Alunite 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 Alunite and Gahnospinel chemical formula.

Chemical formula of Alunite- KAl3(SO4)2(OH)6
Chemical formula of Gahnospinel- (Mg,Zn)Al 2O 4Gemdat.org , Management Team (2012)

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Alunite and Gahnospinel Specific Gravity

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