Dumortierite and Lapis lazuli Physical Properties

Dumortierite

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

3.26-3.412.50-3.00

1 7.18

1.5 Fracture

Fibrous, ConchoidalWalter Schumann, Gemstones of the world (2001) More from other references

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

1.6 Cleavage

Distinct on {100}, poor on {110}; parting on {001}

3,6

1.7 Mohs Hardness

7-8.55.5

2 10

1.8 Chemical Composition

AlAl₆O₃BSi₃O₁₈

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

Dumortierite and Lapis lazuli Chemical Formula

While comparing Dumortierite 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 Dumortierite and Lapis lazuli chemical formula.

Chemical formula of Dumortierite- AlAl₆O₃BSi₃O₁₈
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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Dumortierite and Lapis lazuli Specific Gravity

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