Alunite and Crystal Opal Physical Properties

Alunite

Crystal Opal

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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

2.6-2.91.97-2.22

1 7.18

1.5 Fracture

Conchoidal, Uneven

ConchoidalArthur Thomas, Gemstones (2009), ConchoidalArthur Thomas, Gemstones (2009)

1.6 Cleavage

On {0001}, perfect

Not Available

1.7 Mohs Hardness

3.5-45.5-6.5

2 10

1.8 Chemical Composition

KAl3(SO4)2(OH)6

SiO 2 + H 2OUlrich Henn and Claudio C.

Alunite and Crystal Opal Chemical Formula

While comparing Alunite and Crystal Opal 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 Crystal Opal chemical formula.

Chemical formula of Alunite- KAl3(SO4)2(OH)6
Chemical formula of Crystal Opal- SiO 2 + H 2OUlrich Henn and Claudio C.

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Alunite and Crystal Opal Specific Gravity

Another important criteria for qualitative analysis of gemstones is Alunite and Crystal Opal Specific gravity. Specific gravity is the relative density of a gemstone compared with respect to density of water. Gemologists use Alunite and Crystal Opal Optical Properties during the identification of gemstone. Specific gravity of Alunite is 1.97-2.22 whereas that of Crystal Opal is 1.97-2.22.