Iolite and Lapis lazuli Physical Properties

Iolite

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

2.6-2.72.50-3.00

1 7.18

1.5 Fracture

Not Available

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

1.6 Cleavage

3,1

3,6

1.7 Mohs Hardness

7-7.55.5

2 10

1.8 Chemical Composition

Mg₂Al₄Si₅O₁₈

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

Iolite and Lapis lazuli Chemical Formula

While comparing Iolite 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 Iolite and Lapis lazuli chemical formula.

Chemical formula of Iolite- Mg₂Al₄Si₅O₁₈
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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Iolite and Lapis lazuli Specific Gravity

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