Lazurite and Onyx Physical Properties

Lazurite

Onyx

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1 Physical Properties

1.1 Tenacity

Brittle

Not Available

1.2 Solubility

Soluble

Not Available

1.3 Durability

Not Available

1.4 Specific Gravity

2.752.55-2.70

1 7.18

1.5 Fracture

Uneven, UnevenArthur Thomas, Gemstones (2009), Conchoidal, Brittle

Not Available

1.6 Cleavage

Imperfect on {110}

Indiscernible

1.7 Mohs Hardness

5.56.5-7

2 10

1.8 Chemical Composition

(Na,Ca) 8Al 6Si 6O 24(SO 4,S,Cl) 2Ulrich Henn and Claudio C.

SiO₂

Lazurite and Onyx Chemical Formula

While comparing Lazurite 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 Lazurite and Onyx chemical formula.

Chemical formula of Lazurite- (Na,Ca) 8Al 6Si 6O 24(SO 4,S,Cl) 2Ulrich Henn and Claudio C.
Chemical formula of Onyx- SiO₂

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Lazurite and Onyx Specific Gravity

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