Emerald and Lapis lazuli Physical Properties

Emerald

Lapis lazuli

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1 Physical Properties

1.1 Tenacity

Not Available

1.2 Solubility

Not Available

1.3 Durability

Hard

Not Available

1.4 Specific Gravity

2.67-2.782.50-3.00

1 7.18

1.5 Fracture

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

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

1.6 Cleavage

Imperfect on the [0001]

3,6

1.7 Mohs Hardness

7.5-85.5

2 10

1.8 Chemical Composition

Be₃Al₂SiO₆

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

Emerald and Lapis lazuli Chemical Formula

While comparing Emerald 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 Emerald and Lapis lazuli chemical formula.

Chemical formula of Emerald- Be₃Al₂SiO₆
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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Emerald and Lapis lazuli Specific Gravity

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