Alunite and Cassiterite Physical Properties

Alunite

Cassiterite

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1 Physical Properties

1.1 Tenacity

Brittle

1.2 Solubility

Soluble

insoluble

1.3 Durability

Not Available

1.4 Specific Gravity

2.6-2.96.86-7.03

1 7.18

1.5 Fracture

Conchoidal, Uneven

Subconchoidal, Uneven, ConchoidalArthur Thomas, Gemstones (2009), Irregular

1.6 Cleavage

On {0001}, perfect

{100} imperfect, {110} indistinct; partings on {111} or {011}

1.7 Mohs Hardness

3.5-46-7

2 10

1.8 Chemical Composition

KAl3(SO4)2(OH)6

SnO 2Michael OâDonoghue , Gems, Sixth Edition (2006) More from other references

Alunite and Cassiterite Chemical Formula

While comparing Alunite and Cassiterite 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 Cassiterite chemical formula.

Chemical formula of Alunite- KAl3(SO4)2(OH)6
Chemical formula of Cassiterite- SnO 2Michael OâDonoghue , Gems, Sixth Edition (2006) More from other references

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Alunite and Cassiterite Specific Gravity

Another important criteria for qualitative analysis of gemstones is Alunite and Cassiterite Specific gravity. Specific gravity is the relative density of a gemstone compared with respect to density of water. Gemologists use Alunite and Cassiterite Optical Properties during the identification of gemstone. Specific gravity of Alunite is 6.86-7.03 whereas that of Cassiterite is 6.86-7.03.