Spinel and Lapis lazuli Physical Properties

Spinel

Lapis lazuli

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1 Physical Properties

1.1 Tenacity

Not Available

1.2 Solubility

none

Not Available

1.3 Durability

Not Available

1.4 Specific Gravity

3.64-3.662.50-3.00

1 7.18

1.5 Fracture

Conchoidal, Uneven, ConchoidalArthur Thomas, Gemstones (2009)

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

1.6 Cleavage

None, but may exhibit slight parting

3,6

1.7 Mohs Hardness

85.5

2 10

1.8 Chemical Composition

MgAl₂O₄

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

Spinel and Lapis lazuli Chemical Formula

While comparing Spinel 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 Spinel and Lapis lazuli chemical formula.

Chemical formula of Spinel- MgAl₂O₄
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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Spinel and Lapis lazuli Specific Gravity

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