Alunite and Danburite Physical Properties

Alunite

Danburite

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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

2.6-2.92.97-3.03

1 7.18

1.5 Fracture

Conchoidal, Uneven

Uneven, Uneven, ConchoidalWalter Schumann, Gemstones of the world (2001) More from other references, Conchoidal, Brittle

1.6 Cleavage

On {0001}, perfect

{001} Poor

1.7 Mohs Hardness

3.5-47

2 10

1.8 Chemical Composition

KAl3(SO4)2(OH)6

CaB 2(SiO 4) 2Michael OâDonoghue , Gems, Sixth Edition (2006) More from other references

Alunite and Danburite Chemical Formula

While comparing Alunite and Danburite 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 Danburite chemical formula.

Chemical formula of Alunite- KAl3(SO4)2(OH)6
Chemical formula of Danburite- CaB 2(SiO 4) 2Michael OâDonoghue , Gems, Sixth Edition (2006) More from other references

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Alunite and Danburite Specific Gravity

Another important criteria for qualitative analysis of gemstones is Alunite and Danburite Specific gravity. Specific gravity is the relative density of a gemstone compared with respect to density of water. Gemologists use Alunite and Danburite Optical Properties during the identification of gemstone. Specific gravity of Alunite is 2.97-3.03 whereas that of Danburite is 2.97-3.03.