Tanzanite and Onyx Physical Properties

Tanzanite

Onyx

Add ⊕

1 Physical Properties

1.1 Tenacity

Not Available

1.2 Solubility

Not Available

1.3 Durability

Hard

Not Available

1.4 Specific Gravity

3.352.55-2.70

1 7.18

1.5 Fracture

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

Not Available

1.6 Cleavage

Perfect {010}, imperfect {100}

Indiscernible

1.7 Mohs Hardness

6.5-76.5-7

2 10

1.8 Chemical Composition

Ca₂Al₃(SiO₄)₃(OH)

SiO₂

Tanzanite and Onyx Chemical Formula

While comparing Tanzanite and Onyx 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 Onyx chemical formula.

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

Compare Semi Precious Gemstones

Tanzanite Vs Beryl

Tanzanite Vs Alexandrite

Tanzanite Vs Amethyst

Tanzanite and Onyx Specific Gravity

Another important criteria for qualitative analysis of gemstones is Tanzanite and Onyx Specific gravity. Specific gravity is the relative density of a gemstone compared with respect to density of water. Gemologists use Tanzanite and Onyx Optical Properties during the identification of gemstone. Specific gravity of Tanzanite is 2.55-2.70 whereas that of Onyx is 2.55-2.70.