Onyx and Smoky Quartz Physical Properties

Onyx

Smoky Quartz

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1 Physical Properties

1.1 Tenacity

Not Available

Brittle

1.2 Solubility

Not Available

1.3 Durability

Not Available

1.4 Specific Gravity

2.55-2.702.65

1 7.18

1.5 Fracture

Not Available

Conchoidal, ConchoidalWalter Schumann, Gemstones of the world (2001)

1.6 Cleavage

Indiscernible

{0110} Indistinct

1.7 Mohs Hardness

6.5-77

2 10

1.8 Chemical Composition

SiO₂

Onyx and Smoky Quartz Chemical Formula

While comparing Onyx and Smoky Quartz 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 Smoky Quartz chemical formula.

Chemical formula of Onyx- SiO₂
Chemical formula of Smoky Quartz- SiO₂

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Onyx and Smoky Quartz Specific Gravity

Another important criteria for qualitative analysis of gemstones is Onyx and Smoky Quartz Specific gravity. Specific gravity is the relative density of a gemstone compared with respect to density of water. Gemologists use Onyx and Smoky Quartz Optical Properties during the identification of gemstone. Specific gravity of Onyx is 2.65 whereas that of Smoky Quartz is 2.65.