Star Sapphire and Lazurite Physical Properties

Star Sapphire

Lazurite

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1 Physical Properties

1.1 Tenacity

Not Available

Brittle

1.2 Solubility

Not Available

Soluble

1.3 Durability

Not Available

1.4 Specific Gravity

3.90-4.052.75

1 7.18

1.5 Fracture

Not Available

Uneven, UnevenArthur Thomas, Gemstones (2009), Conchoidal, Brittle

1.6 Cleavage

Not Available

Imperfect on {110}

1.7 Mohs Hardness

Not Available5.5

2 10

1.8 Chemical Composition

Al 2O 3Ulrich Henn and Claudio C.

(Na,Ca) 8Al 6Si 6O 24(SO 4,S,Cl) 2Ulrich Henn and Claudio C.

Star Sapphire and Lazurite Chemical Formula

While comparing Star Sapphire and Lazurite 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 Star Sapphire and Lazurite chemical formula.

Chemical formula of Star Sapphire- Al 2O 3Ulrich Henn and Claudio C.
Chemical formula of Lazurite- (Na,Ca) 8Al 6Si 6O 24(SO 4,S,Cl) 2Ulrich Henn and Claudio C.

Compare Blue Gemstones

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Star Sapphire Vs Tortoiseshell

Star Sapphire Vs Tourmaline

Star Sapphire and Lazurite Specific Gravity

Another important criteria for qualitative analysis of gemstones is Star Sapphire and Lazurite Specific gravity. Specific gravity is the relative density of a gemstone compared with respect to density of water. Gemologists use Star Sapphire and Lazurite Optical Properties during the identification of gemstone. Specific gravity of Star Sapphire is 2.75 whereas that of Lazurite is 2.75.