Alunite and Topaz Physical Properties

Alunite

Topaz

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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

2.6-2.93.49-3.57

1 7.18

1.5 Fracture

Conchoidal, Uneven

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

1.6 Cleavage

On {0001}, perfect

[001] Perfect

1.7 Mohs Hardness

3.5-48

2 10

1.8 Chemical Composition

KAl3(SO4)2(OH)6

Al₂SiO₄(F,OH)₂

Alunite and Topaz Chemical Formula

While comparing Alunite and Topaz 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 Topaz chemical formula.

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

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Alunite and Topaz Specific Gravity

Another important criteria for qualitative analysis of gemstones is Alunite and Topaz Specific gravity. Specific gravity is the relative density of a gemstone compared with respect to density of water. Gemologists use Alunite and Topaz Optical Properties during the identification of gemstone. Specific gravity of Alunite is 3.49-3.57 whereas that of Topaz is 3.49-3.57.