Alunite and Tanzanite Physical Properties

Alunite

Tanzanite

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1 Physical Properties

1.1 Tenacity

Brittle

Not Available

1.2 Solubility

Soluble

Not Available

1.3 Durability

Not Available

Hard

1.4 Specific Gravity

2.6-2.93.35

1 7.18

1.5 Fracture

Conchoidal, Uneven

Uneven, Conchoidal, UnevenWalter Schumann, Gemstones of the world (2001)

1.6 Cleavage

On {0001}, perfect

Perfect {010}, imperfect {100}

1.7 Mohs Hardness

3.5-46.5-7

2 10

2.5 Chemical Composition

KAl3(SO4)2(OH)6

Ca₂Al₃(SiO₄)₃(OH)

Alunite and Tanzanite Chemical Formula

While comparing Alunite and Tanzanite 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 Tanzanite chemical formula.

Chemical formula of Alunite- KAl3(SO4)2(OH)6
Chemical formula of Tanzanite- Ca₂Al₃(SiO₄)₃(OH)

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Alunite and Tanzanite Specific Gravity

Another important criteria for qualitative analysis of gemstones is Alunite and Tanzanite Specific gravity. Specific gravity is the relative density of a gemstone compared with respect to density of water. Gemologists use Alunite and Tanzanite Optical Properties during the identification of gemstone. Specific gravity of Alunite is 3.35 whereas that of Tanzanite is 3.35.