Topaz and Lapis lazuli Physical Properties

Topaz

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

3.49-3.572.50-3.00

1 7.18

1.5 Fracture

Subconchoidal, Uneven, ConchoidalArthur Thomas, Gemstones (2009), Brittle

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

1.6 Cleavage

[001] Perfect

3,6

1.7 Mohs Hardness

85.5

2 10

1.8 Chemical Composition

Al₂SiO₄(F,OH)₂

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

Topaz and Lapis lazuli Chemical Formula

While comparing Topaz 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 Topaz and Lapis lazuli chemical formula.

Chemical formula of Topaz- Al₂SiO₄(F,OH)₂
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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Topaz and Lapis lazuli Specific Gravity

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