Alunite and Lazurite Physical Properties

Alunite

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

2.6-2.92.75

1 7.18

1.5 Fracture

Conchoidal, Uneven

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

1.6 Cleavage

On {0001}, perfect

Imperfect on {110}

1.7 Mohs Hardness

3.5-45.5

2 10

1.8 Chemical Composition

KAl3(SO4)2(OH)6

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

Alunite and Lazurite Chemical Formula

While comparing Alunite 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 Alunite and Lazurite chemical formula.

Chemical formula of Alunite- KAl3(SO4)2(OH)6
Chemical formula of Lazurite- (Na,Ca) 8Al 6Si 6O 24(SO 4,S,Cl) 2Ulrich Henn and Claudio C.

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Alunite and Lazurite Specific Gravity

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