Rutile and Alunite Physical Properties

Rutile

Alunite

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1 Physical Properties

1.1 Tenacity

Not Available

Brittle

1.2 Solubility

Insoluble in acids

Soluble

1.3 Durability

Not Available

1.4 Specific Gravity

4.20-4.302.6-2.9

1 7.18

1.5 Fracture

Uneven, ConchoidalArthur Thomas, Gemstones (2009)

Conchoidal, Uneven

1.6 Cleavage

{110} good, 100 moderate, parting on {092} and {011}

On {0001}, perfect

1.7 Mohs Hardness

6-6.53.5-4

2 10

1.8 Chemical Composition

TiO 2Michael OâDonoghue , Gems, Sixth Edition (2006)

KAl3(SO4)2(OH)6

Rutile and Alunite Chemical Formula

While comparing Rutile 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 Rutile and Alunite chemical formula.

Chemical formula of Rutile- TiO 2Michael OâDonoghue , Gems, Sixth Edition (2006)
Chemical formula of Alunite- KAl3(SO4)2(OH)6

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Rutile and Alunite Specific Gravity

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