Alunite and Rutile Physical Properties

Alunite

Rutile

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1 Physical Properties

1.1 Tenacity

Brittle

Not Available

1.2 Solubility

Soluble

Insoluble in acids

1.3 Durability

Not Available

1.4 Specific Gravity

2.6-2.94.20-4.30

1 7.18

1.5 Fracture

Conchoidal, Uneven

Uneven, ConchoidalArthur Thomas, Gemstones (2009)

1.6 Cleavage

On {0001}, perfect

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

1.7 Mohs Hardness

3.5-46-6.5

2 10

1.8 Chemical Composition

KAl3(SO4)2(OH)6

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

Alunite and Rutile Chemical Formula

While comparing Alunite and Rutile 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 Rutile chemical formula.

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

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Alunite and Rutile Specific Gravity

Another important criteria for qualitative analysis of gemstones is Alunite and Rutile Specific gravity. Specific gravity is the relative density of a gemstone compared with respect to density of water. Gemologists use Alunite and Rutile Optical Properties during the identification of gemstone. Specific gravity of Alunite is 4.20-4.30 whereas that of Rutile is 4.20-4.30.