Chalcedony and Lapis lazuli Physical Properties

Chalcedony

Lapis lazuli

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1 Physical Properties

1.1 Tenacity

Not Available

1.2 Solubility

Soluble

Not Available

1.3 Durability

Not Available

1.4 Specific Gravity

2.55-2.702.50-3.00

1 7.18

1.5 Fracture

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

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

1.6 Cleavage

Absent

3,6

1.7 Mohs Hardness

6.5-75.5

2 10

1.8 Chemical Composition

SiO₂

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

Chalcedony and Lapis lazuli Chemical Formula

While comparing Chalcedony 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 Chalcedony and Lapis lazuli chemical formula.

Chemical formula of Chalcedony- SiO₂
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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Chalcedony and Lapis lazuli Specific Gravity

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