Lapis lazuli and Sylvite Physical Properties

Lapis lazuli

Sylvite

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1 Physical Properties

1.1 Tenacity

Not Available

Brittle

1.2 Solubility

Not Available

Soluble

1.3 Durability

Not Available

1.4 Specific Gravity

2.50-3.001.993

1 7.18

1.5 Fracture

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

Uneven, Brittle

1.6 Cleavage

3,6

Perfect on [100], [010], [001]

1.7 Mohs Hardness

5.52.5

2 10

1.8 Chemical Composition

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

Not Available

Lapis lazuli and Sylvite Chemical Formula

While comparing Lapis lazuli and Sylvite 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 Sylvite 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

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Lapis lazuli and Sylvite Specific Gravity

Another important criteria for qualitative analysis of gemstones is Lapis lazuli and Sylvite Specific gravity. Specific gravity is the relative density of a gemstone compared with respect to density of water. Gemologists use Lapis lazuli and Sylvite Optical Properties during the identification of gemstone. Specific gravity of Lapis lazuli is 1.993 whereas that of Sylvite is 1.993.