Alunite and Cuprite Physical Properties

Alunite

Cuprite

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1 Physical Properties

1.1 Tenacity

Brittle

1.2 Solubility

Soluble

Not Available

1.3 Durability

Not Available

1.4 Specific Gravity

2.6-2.95.85-6.15

1 7.18

1.5 Fracture

Conchoidal, Uneven

Conchoidal, Metallic, UnevenArthur Thomas, Gemstones (2009), Brittle, Conchoidal

1.6 Cleavage

On {0001}, perfect

Fair in four directions forming octahedrons

1.7 Mohs Hardness

3.5-43.5-4

2 10

1.8 Chemical Composition

KAl3(SO4)2(OH)6

Cu 2OMichael OâDonoghue , Gems, Sixth Edition (2006) More from other references

Alunite and Cuprite Chemical Formula

While comparing Alunite and Cuprite 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 Cuprite chemical formula.

Chemical formula of Alunite- KAl3(SO4)2(OH)6
Chemical formula of Cuprite- Cu 2OMichael OâDonoghue , Gems, Sixth Edition (2006) More from other references

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Alunite and Cuprite Specific Gravity

Another important criteria for qualitative analysis of gemstones is Alunite and Cuprite Specific gravity. Specific gravity is the relative density of a gemstone compared with respect to density of water. Gemologists use Alunite and Cuprite Optical Properties during the identification of gemstone. Specific gravity of Alunite is 5.85-6.15 whereas that of Cuprite is 5.85-6.15.