Lazurite and Purpurite Physical Properties

Lazurite

Purpurite

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1 Physical Properties

1.1 Tenacity

Brittle

Not Available

1.2 Solubility

Soluble

Not Available

1.3 Durability

Not Available

1.4 Specific Gravity

2.753.2-3.4

1 7.18

1.5 Fracture

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

Uneven, UnevenArthur Thomas, Gemstones (2009), Brittle

1.6 Cleavage

Imperfect on {110}

[100] [001] perfect

1.7 Mohs Hardness

5.54-4.5

2 10

1.8 Chemical Composition

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

MnPO 4Walter Schumann , Gemstones of the world (2001) More from other references

Lazurite and Purpurite Chemical Formula

While comparing Lazurite and Purpurite 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 Lazurite and Purpurite chemical formula.

Chemical formula of Lazurite- (Na,Ca) 8Al 6Si 6O 24(SO 4,S,Cl) 2Ulrich Henn and Claudio C.
Chemical formula of Purpurite- MnPO 4Walter Schumann , Gemstones of the world (2001) More from other references

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Lazurite and Purpurite Specific Gravity

Another important criteria for qualitative analysis of gemstones is Lazurite and Purpurite Specific gravity. Specific gravity is the relative density of a gemstone compared with respect to density of water. Gemologists use Lazurite and Purpurite Optical Properties during the identification of gemstone. Specific gravity of Lazurite is 3.2-3.4 whereas that of Purpurite is 3.2-3.4.