Gahnospinel and Alunite Physical Properties

Gahnospinel

Alunite

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1 Physical Properties

1.1 Tenacity

Not Available

Brittle

1.2 Solubility

Not Available

Soluble

1.3 Durability

Not Available

1.4 Specific Gravity

3.65-4.552.6-2.9

1 7.18

1.5 Fracture

ConchoidalArthur Thomas, Gemstones (2009)

Conchoidal, Uneven

1.6 Cleavage

None, but may exhibit slight parting

On {0001}, perfect

1.7 Mohs Hardness

7.5-83.5-4

2 10

1.8 Chemical Composition

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

KAl3(SO4)2(OH)6

Gahnospinel and Alunite Chemical Formula

While comparing Gahnospinel and Alunite 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 Gahnospinel and Alunite chemical formula.

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

Compare Blue Gemstones

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Gahnospinel Vs Jeremejevite

Gahnospinel and Alunite Specific Gravity

Another important criteria for qualitative analysis of gemstones is Gahnospinel and Alunite Specific gravity. Specific gravity is the relative density of a gemstone compared with respect to density of water. Gemologists use Gahnospinel and Alunite Optical Properties during the identification of gemstone. Specific gravity of Gahnospinel is 2.6-2.9 whereas that of Alunite is 2.6-2.9.