Sard and Alunite Physical Properties

Sard

Alunite

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1 Physical Properties

1.1 Tenacity

Not Available

Brittle

1.2 Solubility

Not Available

Soluble

1.3 Durability

Not Available

1.4 Specific Gravity

2.58-2.632.6-2.9

1 7.18

1.5 Fracture

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

Conchoidal, Uneven

1.6 Cleavage

Not Available

On {0001}, perfect

1.7 Mohs Hardness

6.5-73.5-4

2 10

1.8 Chemical Composition

SiO 2Ulrich Henn and Claudio C.

KAl3(SO4)2(OH)6

Sard and Alunite Chemical Formula

While comparing Sard and Alunite 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 Sard and Alunite chemical formula.

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

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Sard and Alunite Specific Gravity

Another important criteria for qualitative analysis of gemstones is Sard and Alunite Specific gravity. Specific gravity is the relative density of a gemstone compared with respect to density of water. Gemologists use Sard and Alunite Optical Properties during the identification of gemstone. Specific gravity of Sard is 2.6-2.9 whereas that of Alunite is 2.6-2.9.