Lapis lazuli and Dumortierite Physical Properties

Lapis lazuli

Dumortierite

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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

2.50-3.00

3.26-3.41

1.5 Fracture

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

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

1.6 Cleavage

3,6

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

1.7 Mohs Hardness

5.5

7-8.5

1.8 Chemical Composition

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

AlAl₆O₃BSi₃O₁₈

Lapis lazuli and Dumortierite Chemical Formula

While comparing Lapis lazuli and Dumortierite 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 Dumortierite 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 Dumortierite- AlAl₆O₃BSi₃O₁₈

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Lapis lazuli and Dumortierite Specific Gravity

Another important criteria for qualitative analysis of gemstones is Lapis lazuli and Dumortierite Specific gravity. Specific gravity is the relative density of a gemstone compared with respect to density of water. Gemologists use Lapis lazuli and Dumortierite Optical Properties during the identification of gemstone. Specific gravity of Lapis lazuli is 3.26-3.41 whereas that of Dumortierite is 3.26-3.41.