Riebeckite and Alunite Physical Properties

Riebeckite

Alunite

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1 Physical Properties

1.1 Tenacity

Brittle

1.2 Solubility

Not Available

Soluble

1.3 Durability

Not Available

1.4 Specific Gravity

3.28-3.442.6-2.9

1 7.18

1.5 Fracture

Uneven, Splintery, Brittle

Conchoidal, Uneven

1.6 Cleavage

Perfect on {110}, intersecting at 56° and 124°; partings on {100} and {010}

On {0001}, perfect

1.7 Mohs Hardness

5.0-6.03.5-4

2 10

1.8 Chemical Composition

Not Available

KAl3(SO4)2(OH)6

Riebeckite and Alunite Chemical Formula

While comparing Riebeckite 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 Riebeckite and Alunite chemical formula.

Chemical formula of Alunite- KAl3(SO4)2(OH)6

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Riebeckite and Alunite Specific Gravity

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