Calcite and Lapis lazuli Physical Properties

Calcite

Lapis lazuli

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1 Physical Properties

1.1 Tenacity

Brittle

Not Available

1.2 Solubility

Soluble

Not Available

1.3 Durability

Not Available

1.4 Specific Gravity

2.67-2.73

2.50-3.00

1.5 Fracture

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

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

1.6 Cleavage

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

3,6

1.7 Mohs Hardness

5.5

1.8 Chemical Composition

CaCO 3Ulrich Henn and Claudio C.

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

Calcite and Lapis lazuli Chemical Formula

While comparing Calcite 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 Calcite and Lapis lazuli chemical formula.

Chemical formula of Calcite- CaCO 3Ulrich Henn and Claudio C.
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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Calcite and Lapis lazuli Specific Gravity

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