Chrysoprase and Lapis lazuli Physical Properties

Chrysoprase

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

2.58-2.642.50-3.00

1 7.18

1.5 Fracture

Gems, Sixth Edition (2006)

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

1.6 Cleavage

None

3,6

1.7 Mohs Hardness

6.5-75.5

2 10

1.8 Chemical Composition

SiO₂ (with a high level of nickel impurities )

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

Chrysoprase and Lapis lazuli Chemical Formula

While comparing Chrysoprase 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 Chrysoprase and Lapis lazuli chemical formula.

Chemical formula of Chrysoprase- SiO₂ (with a high level of nickel impurities )
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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Chrysoprase and Lapis lazuli Specific Gravity

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