Topaz and Alunite Physical Properties

Topaz

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

3.49-3.572.6-2.9

1 7.18

1.5 Fracture

Subconchoidal, Uneven, ConchoidalArthur Thomas, Gemstones (2009), Brittle

Conchoidal, Uneven

1.6 Cleavage

[001] Perfect

On {0001}, perfect

1.7 Mohs Hardness

83.5-4

2 10

1.8 Chemical Composition

Al₂SiO₄(F,OH)₂

KAl3(SO4)2(OH)6

Topaz and Alunite Chemical Formula

While comparing Topaz 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 Topaz and Alunite chemical formula.

Chemical formula of Topaz- Al₂SiO₄(F,OH)₂
Chemical formula of Alunite- KAl3(SO4)2(OH)6

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Topaz and Alunite Specific Gravity

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