Onyx and Tanzanite Physical Properties

Onyx

Tanzanite

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1 Physical Properties

1.1 Tenacity

Not Available

1.2 Solubility

Not Available

1.3 Durability

Not Available

Hard

1.4 Specific Gravity

2.55-2.703.35

1 7.18

1.5 Fracture

Not Available

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

1.6 Cleavage

Indiscernible

Perfect {010}, imperfect {100}

1.7 Mohs Hardness

6.5-76.5-7

2 10

1.8 Chemical Composition

SiO₂

Ca₂Al₃(SiO₄)₃(OH)

Onyx and Tanzanite Chemical Formula

While comparing Onyx 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 Onyx and Tanzanite chemical formula.

Chemical formula of Onyx- SiO₂
Chemical formula of Tanzanite- Ca₂Al₃(SiO₄)₃(OH)

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Onyx and Tanzanite Specific Gravity

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