Alunite and Malachite Physical Properties

Alunite

Malachite

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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

2.6-2.93.25-4.10

1 7.18

1.5 Fracture

Conchoidal, Uneven

Conchoidal, Conchoidal, Gemstones (2009), Uneven

1.6 Cleavage

On {0001}, perfect

Perfect on { 2 01} fair on {010}

1.7 Mohs Hardness

3.5-43.5-4

2 10

1.8 Chemical Composition

KAl3(SO4)2(OH)6

Cu₂CO₃(OH)₂

Alunite and Malachite Chemical Formula

While comparing Alunite and Malachite 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 Malachite chemical formula.

Chemical formula of Alunite- KAl3(SO4)2(OH)6
Chemical formula of Malachite- Cu₂CO₃(OH)₂

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Alunite and Malachite Specific Gravity

Another important criteria for qualitative analysis of gemstones is Alunite and Malachite Specific gravity. Specific gravity is the relative density of a gemstone compared with respect to density of water. Gemologists use Alunite and Malachite Optical Properties during the identification of gemstone. Specific gravity of Alunite is 3.25-4.10 whereas that of Malachite is 3.25-4.10.