Alunite and Gibbsite Physical Properties

Alunite

Gibbsite

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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

2.6-2.92.35

1 7.18

1.5 Fracture

Conchoidal, Uneven

Fibrous, Difficult, Fibrous

1.6 Cleavage

On {0001}, perfect

{001} Perfect

1.7 Mohs Hardness

3.5-42.5-3

2 10

1.8 Chemical Composition

KAl3(SO4)2(OH)6

Al(OH)3

Alunite and Gibbsite Chemical Formula

While comparing Alunite and Gibbsite 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 Gibbsite chemical formula.

Chemical formula of Alunite- KAl3(SO4)2(OH)6
Chemical formula of Gibbsite- Al(OH)3

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Alunite and Gibbsite Specific Gravity

Another important criteria for qualitative analysis of gemstones is Alunite and Gibbsite Specific gravity. Specific gravity is the relative density of a gemstone compared with respect to density of water. Gemologists use Alunite and Gibbsite Optical Properties during the identification of gemstone. Specific gravity of Alunite is 2.35 whereas that of Gibbsite is 2.35.