Alunite and Cobaltite Physical Properties

Alunite

Cobaltite

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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

2.6-2.96.3

1 7.18

1.5 Fracture

Conchoidal, Uneven

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

1.6 Cleavage

On {0001}, perfect

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

1.7 Mohs Hardness

3.5-45.5

2 10

1.8 Chemical Composition

KAl3(SO4)2(OH)6

CoAsSAnthony et al , Handbook of mineralogy (2001)

Alunite and Cobaltite Chemical Formula

While comparing Alunite and Cobaltite 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 Cobaltite chemical formula.

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

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Alunite and Cobaltite Specific Gravity

Another important criteria for qualitative analysis of gemstones is Alunite and Cobaltite Specific gravity. Specific gravity is the relative density of a gemstone compared with respect to density of water. Gemologists use Alunite and Cobaltite Optical Properties during the identification of gemstone. Specific gravity of Alunite is 6.3 whereas that of Cobaltite is 6.3.