Tanzanite and Alunite Physical Properties

Tanzanite

Alunite

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1 Physical Properties

1.1 Tenacity

Not Available

Brittle

1.2 Solubility

Not Available

Soluble

1.3 Durability

Hard

Not Available

1.4 Specific Gravity

3.352.6-2.9

1 7.18

1.5 Fracture

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

Conchoidal, Uneven

1.6 Cleavage

Perfect {010}, imperfect {100}

On {0001}, perfect

1.7 Mohs Hardness

6.5-73.5-4

2 10

1.8 Chemical Composition

Ca₂Al₃(SiO₄)₃(OH)

KAl3(SO4)2(OH)6

Tanzanite and Alunite Chemical Formula

While comparing Tanzanite 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 Tanzanite and Alunite chemical formula.

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

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Tanzanite and Alunite Specific Gravity

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