Tanzanite and Topaz Physical Properties

Tanzanite

Topaz

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1 Physical Properties

1.1 Tenacity

Not Available

1.2 Solubility

Not Available

1.3 Durability

Hard

Not Available

1.4 Specific Gravity

3.35

3.49-3.57

1.5 Fracture

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

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

1.6 Cleavage

Perfect {010}, imperfect {100}

[001] Perfect

1.7 Mohs Hardness

6.5-7

1.8 Chemical Composition

Ca₂Al₃(SiO₄)₃(OH)

Al₂SiO₄(F,OH)₂

Tanzanite and Topaz Chemical Formula

While comparing Tanzanite 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 Tanzanite and Topaz chemical formula.

Chemical formula of Tanzanite- Ca₂Al₃(SiO₄)₃(OH)
Chemical formula of Topaz- Al₂SiO₄(F,OH)₂

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Tanzanite and Topaz Specific Gravity

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