Cobaltite and Alunite Physical Properties

Cobaltite

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

6.32.6-2.9

1 7.18

1.5 Fracture

UnevenAnthony et al, Handbook of mineralogy (2001) More from other references, UnevenAnthony et al, Handbook of mineralogy (2001) More from other references, Brittle, Metallic

Conchoidal, Uneven

1.6 Cleavage

{100} Good, {010} Good, {001} Good

On {0001}, perfect

1.7 Mohs Hardness

5.53.5-4

2 10

1.8 Chemical Composition

CoAsSAnthony et al , Handbook of mineralogy (2001)

KAl3(SO4)2(OH)6

Cobaltite and Alunite Chemical Formula

While comparing Cobaltite 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 Cobaltite and Alunite chemical formula.

Chemical formula of Cobaltite- CoAsSAnthony et al , Handbook of mineralogy (2001)
Chemical formula of Alunite- KAl3(SO4)2(OH)6

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Cobaltite and Alunite Specific Gravity

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