Alunite and Omphacite Physical Properties

Alunite

Omphacite

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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

2.6-2.93.16-3.43

1 7.18

1.5 Fracture

Conchoidal, Uneven

Uneven, Uneven, ConchoidalAnthony et al, Handbook of mineralogy (2001), Brittle, Conchoidal

1.6 Cleavage

On {0001}, perfect

{110} Good, {110} Good

1.7 Mohs Hardness

3.5-45-6

2 10

1.8 Chemical Composition

KAl3(SO4)2(OH)6

(Ca,Na)(Mg,Fe,Al)Si 2O 6Anthony et al , Handbook of Mineralogy (2001)

Alunite and Omphacite Chemical Formula

While comparing Alunite and Omphacite 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 Omphacite chemical formula.

Chemical formula of Alunite- KAl3(SO4)2(OH)6
Chemical formula of Omphacite- (Ca,Na)(Mg,Fe,Al)Si 2O 6Anthony et al , Handbook of Mineralogy (2001)

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Alunite and Omphacite Specific Gravity

Another important criteria for qualitative analysis of gemstones is Alunite and Omphacite Specific gravity. Specific gravity is the relative density of a gemstone compared with respect to density of water. Gemologists use Alunite and Omphacite Optical Properties during the identification of gemstone. Specific gravity of Alunite is 3.16-3.43 whereas that of Omphacite is 3.16-3.43.