Onyx and Lapis lazuli Physical Properties

Onyx

Lapis lazuli

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1 Physical Properties

1.1 Tenacity

Not Available

1.2 Solubility

Not Available

1.3 Durability

Not Available

1.4 Specific Gravity

2.55-2.702.50-3.00

1 7.18

1.5 Fracture

Not Available

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

1.6 Cleavage

Indiscernible

3,6

1.7 Mohs Hardness

6.5-75.5

2 10

1.8 Chemical Composition

SiO₂

The chief constituent Lapis Lazuli is Lazurite, with the following chemical formula: (Na,Ca)₈Al₆Si₆O₂₄(S,SO)₄

Onyx and Lapis lazuli Chemical Formula

While comparing Onyx and Lapis lazuli 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 Lapis lazuli chemical formula.

Chemical formula of Onyx- SiO₂
Chemical formula of Lapis lazuli- The chief constituent Lapis Lazuli is Lazurite, with the following chemical formula: (Na,Ca)₈Al₆Si₆O₂₄(S,SO)₄

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Onyx and Lapis lazuli Specific Gravity

Another important criteria for qualitative analysis of gemstones is Onyx and Lapis lazuli Specific gravity. Specific gravity is the relative density of a gemstone compared with respect to density of water. Gemologists use Onyx and Lapis lazuli Optical Properties during the identification of gemstone. Specific gravity of Onyx is 2.50-3.00 whereas that of Lapis lazuli is 2.50-3.00.