Alunite and Kornerupine Physical Properties

Alunite

Kornerupine

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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

2.6-2.93.25-3.45

1 7.18

1.5 Fracture

Conchoidal, Uneven

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

1.6 Cleavage

On {0001}, perfect

Good on {110}

1.7 Mohs Hardness

3.5-46.5

2 10

1.8 Chemical Composition

KAl3(SO4)2(OH)6

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

Alunite and Kornerupine Chemical Formula

While comparing Alunite and Kornerupine 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 Kornerupine chemical formula.

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

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Alunite and Kornerupine Specific Gravity

Another important criteria for qualitative analysis of gemstones is Alunite and Kornerupine Specific gravity. Specific gravity is the relative density of a gemstone compared with respect to density of water. Gemologists use Alunite and Kornerupine Optical Properties during the identification of gemstone. Specific gravity of Alunite is 3.25-3.45 whereas that of Kornerupine is 3.25-3.45.