Alunite and Pezzottaite Physical Properties

Alunite

Pezzottaite

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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

2.6-2.92.90-3.14

1 7.18

1.5 Fracture

Conchoidal, Uneven

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

1.6 Cleavage

On {0001}, perfect

Imperfect; basal

1.7 Mohs Hardness

3.5-47.5-8

2 10

1.8 Chemical Composition

KAl3(SO4)2(OH)6

(Be,Cs) 3Al 2Si 6O 18 · 0.5H 2OUlrich Henn and Claudio C.

Alunite and Pezzottaite Chemical Formula

While comparing Alunite and Pezzottaite 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 Pezzottaite chemical formula.

Chemical formula of Alunite- KAl3(SO4)2(OH)6
Chemical formula of Pezzottaite- (Be,Cs) 3Al 2Si 6O 18 · 0.5H 2OUlrich Henn and Claudio C.

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Alunite and Pezzottaite Specific Gravity

Another important criteria for qualitative analysis of gemstones is Alunite and Pezzottaite Specific gravity. Specific gravity is the relative density of a gemstone compared with respect to density of water. Gemologists use Alunite and Pezzottaite Optical Properties during the identification of gemstone. Specific gravity of Alunite is 2.90-3.14 whereas that of Pezzottaite is 2.90-3.14.