Alunite and Sard Physical Properties

Alunite

Sard

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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

2.6-2.92.58-2.63

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

3.5-46.5-7

2 10

1.8 Chemical Composition

KAl3(SO4)2(OH)6

SiO 2Ulrich Henn and Claudio C.

Alunite and Sard Chemical Formula

While comparing Alunite and Sard 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 Sard chemical formula.

Chemical formula of Alunite- KAl3(SO4)2(OH)6
Chemical formula of Sard- SiO 2Ulrich Henn and Claudio C.

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Alunite and Sard Specific Gravity

Another important criteria for qualitative analysis of gemstones is Alunite and Sard Specific gravity. Specific gravity is the relative density of a gemstone compared with respect to density of water. Gemologists use Alunite and Sard Optical Properties during the identification of gemstone. Specific gravity of Alunite is 2.58-2.63 whereas that of Sard is 2.58-2.63.