Polyhalite and Lazurite Physical Properties

Polyhalite

Lazurite

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1 Physical Properties

1.1 Tenacity

Brittle

1.2 Solubility

Soluble

1.3 Durability

Not Available

1.4 Specific Gravity

2.782.75

1 7.18

1.5 Fracture

Conchoidal, Brittle

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

1.6 Cleavage

Perfect on {10 1 }; parting on {010}

Imperfect on {110}

1.7 Mohs Hardness

3.55.5

2 10

1.8 Chemical Composition

Not Available

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

Polyhalite and Lazurite Chemical Formula

While comparing Polyhalite 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 Polyhalite and Lazurite chemical formula.

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

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Polyhalite and Lazurite Specific Gravity

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