Alunite and Eosphorite Physical Properties

Alunite

Eosphorite

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1 Physical Properties

1.1 Tenacity

Brittle

Not Available

1.2 Solubility

Soluble

Not Available

1.3 Durability

Not Available

1.4 Specific Gravity

2.6-2.93.05-3.08

1 7.18

1.5 Fracture

Conchoidal, Uneven

Subconchoidal, Uneven, Conchoidal, Uneven

1.6 Cleavage

On {0001}, perfect

Poor on {100}

1.7 Mohs Hardness

3.5-45

2 10

1.8 Chemical Composition

KAl3(SO4)2(OH)6

Mn2+ Al(PO 4)(OH) 2H 2OMichael OâDonoghue , Gems, Sixth Edition (2006)

Alunite and Eosphorite Chemical Formula

While comparing Alunite and Eosphorite 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 Eosphorite chemical formula.

Chemical formula of Alunite- KAl3(SO4)2(OH)6
Chemical formula of Eosphorite- Mn2+ Al(PO 4)(OH) 2H 2OMichael OâDonoghue , Gems, Sixth Edition (2006)

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Alunite and Eosphorite Specific Gravity

Another important criteria for qualitative analysis of gemstones is Alunite and Eosphorite Specific gravity. Specific gravity is the relative density of a gemstone compared with respect to density of water. Gemologists use Alunite and Eosphorite Optical Properties during the identification of gemstone. Specific gravity of Alunite is 3.05-3.08 whereas that of Eosphorite is 3.05-3.08.