Kornerupine and Alunite Physical Properties

Kornerupine

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

3.25-3.452.6-2.9

1 7.18

1.5 Fracture

ConchoidalArthur Thomas, Gemstones (2009), ConchoidalArthur Thomas, Gemstones (2009), Brittle, Uneven

Conchoidal, Uneven

1.6 Cleavage

Good on {110}

On {0001}, perfect

1.7 Mohs Hardness

6.53.5-4

2 10

1.8 Chemical Composition

Mg 3Al 6(Si,Al,B) 5O 21(OH)Walter Schumann , Gemstones of the world (2001) More from other references

KAl3(SO4)2(OH)6

Kornerupine and Alunite Chemical Formula

While comparing Kornerupine 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 Kornerupine and Alunite chemical formula.

Chemical formula of Kornerupine- Mg 3Al 6(Si,Al,B) 5O 21(OH)Walter Schumann , Gemstones of the world (2001) More from other references
Chemical formula of Alunite- KAl3(SO4)2(OH)6

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Kornerupine and Alunite Specific Gravity

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