Lapis lazuli and Spinel Physical Properties

Lapis lazuli

Spinel

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1 Physical Properties

1.1 Tenacity

Not Available

1.2 Solubility

Not Available

none

1.3 Durability

Not Available

1.4 Specific Gravity

2.50-3.00

3.64-3.66

1.5 Fracture

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

Conchoidal, Uneven, ConchoidalArthur Thomas, Gemstones (2009)

1.6 Cleavage

3,6

None, but may exhibit slight parting

1.7 Mohs Hardness

5.5

1.8 Chemical Composition

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

MgAl₂O₄

Lapis lazuli and Spinel Chemical Formula

While comparing Lapis lazuli and Spinel 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 Spinel 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 Spinel- MgAl₂O₄

Compare Gems for Sagittarius

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Lapis lazuli and Spinel Specific Gravity

Another important criteria for qualitative analysis of gemstones is Lapis lazuli and Spinel Specific gravity. Specific gravity is the relative density of a gemstone compared with respect to density of water. Gemologists use Lapis lazuli and Spinel Optical Properties during the identification of gemstone. Specific gravity of Lapis lazuli is 3.64-3.66 whereas that of Spinel is 3.64-3.66.