Opal and Lapis lazuli Physical Properties

Opal

Lapis lazuli

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1 Physical Properties

1.1 Tenacity

BrittleWalter Schumann

Not Available

1.2 Solubility

hot salt water

Not Available

1.3 Durability

Not Available

1.4 Specific Gravity

1.98-2.252.50-3.00

1 7.18

1.5 Fracture

Conchoidal, Conchoidal, Gemstones of the world (2001) More from other references, Brittle

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

1.6 Cleavage

None

3,6

1.7 Mohs Hardness

5-6.55.5

2 10

1.8 Chemical Composition

SiO₂ · nH₂O

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

Opal and Lapis lazuli Chemical Formula

While comparing Opal 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 Opal and Lapis lazuli chemical formula.

Chemical formula of Opal- SiO₂ · nH₂O
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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Opal and Lapis lazuli Specific Gravity

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