Lapis lazuli and Calcite Physical Properties

Lapis lazuli

Calcite

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1 Physical Properties

1.1 Tenacity

Not Available

Brittle

1.2 Solubility

Not Available

Soluble

1.3 Durability

Not Available

1.4 Specific Gravity

2.50-3.002.67-2.73

1 7.18

1.5 Fracture

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

Conchoidal, ConchoidalArthur Thomas, Gemstones (2009), ConchoidalArthur Thomas, Gemstones (2009), Brittle, Conchoidal

1.6 Cleavage

3,6

Perfect on [10 1 1] three directions with angle of 74° 55

1.7 Mohs Hardness

5.53

2 10

1.8 Chemical Composition

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

CaCO 3Ulrich Henn and Claudio C.

Lapis lazuli and Calcite Chemical Formula

While comparing Lapis lazuli and Calcite 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 Calcite 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 Calcite- CaCO 3Ulrich Henn and Claudio C.

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Lapis lazuli and Calcite Specific Gravity

Another important criteria for qualitative analysis of gemstones is Lapis lazuli and Calcite Specific gravity. Specific gravity is the relative density of a gemstone compared with respect to density of water. Gemologists use Lapis lazuli and Calcite Optical Properties during the identification of gemstone. Specific gravity of Lapis lazuli is 2.67-2.73 whereas that of Calcite is 2.67-2.73.