Lapis lazuli and Opal Physical Properties

Lapis lazuli

Opal

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1 Physical Properties

1.1 Tenacity

Not Available

BrittleWalter Schumann

1.2 Solubility

Not Available

hot salt water

1.3 Durability

Not Available

1.4 Specific Gravity

2.50-3.00

1.98-2.25

1.5 Fracture

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

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

1.6 Cleavage

3,6

None

1.7 Mohs Hardness

5.5

5-6.5

1.8 Chemical Composition

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

SiO₂ · nH₂O

Lapis lazuli and Opal Chemical Formula

While comparing Lapis lazuli and Opal 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 Lapis lazuli and Opal chemical formula.

Chemical formula of Lapis lazuli- The chief constituent Lapis Lazuli is Lazurite, with the following chemical formula: (Na,Ca)₈Al₆Si₆O₂₄(S,SO)₄
Chemical formula of Opal- SiO₂ · nH₂O

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Lapis lazuli and Opal Specific Gravity

Another important criteria for qualitative analysis of gemstones is Lapis lazuli and Opal Specific gravity. Specific gravity is the relative density of a gemstone compared with respect to density of water. Gemologists use Lapis lazuli and Opal Optical Properties during the identification of gemstone. Specific gravity of Lapis lazuli is 1.98-2.25 whereas that of Opal is 1.98-2.25.