Lapis lazuli and Chalcedony Physical Properties

Lapis lazuli

Chalcedony

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1 Physical Properties

1.1 Tenacity

Not Available

1.2 Solubility

Not Available

Soluble

1.3 Durability

Not Available

1.4 Specific Gravity

2.50-3.00

2.55-2.70

1.5 Fracture

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

Uneven, Splintery, Conchoidal, Uneven, Splintery, Conchoidal, UnevenWalter Schumann

1.6 Cleavage

3,6

Absent

1.7 Mohs Hardness

5.5

6.5-7

1.8 Chemical Composition

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

SiO₂

Lapis lazuli and Chalcedony Chemical Formula

While comparing Lapis lazuli and Chalcedony 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 Chalcedony 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 Chalcedony- SiO₂

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Lapis lazuli and Chalcedony Specific Gravity

Another important criteria for qualitative analysis of gemstones is Lapis lazuli and Chalcedony Specific gravity. Specific gravity is the relative density of a gemstone compared with respect to density of water. Gemologists use Lapis lazuli and Chalcedony Optical Properties during the identification of gemstone. Specific gravity of Lapis lazuli is 2.55-2.70 whereas that of Chalcedony is 2.55-2.70.