Apatite and Alunite Physical Properties

Apatite

Alunite

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1 Physical Properties

1.1 Tenacity

Not Available

Brittle

1.2 Solubility

Not Available

Soluble

1.3 Durability

Not Available

1.4 Specific Gravity

3.16-3.232.6-2.9

1 7.18

1.8 Fracture

Conchoidal, Uneven, Conchoidal, Brittle, ConchoidalArthur Thomas, Gemstones (2009), Conchoidal to uneven

Conchoidal, Uneven

1.9 Cleavage

[0001] indistinct, [1010] indistinct

On {0001}, perfect

1.10 Mohs Hardness

53.5-4

2 10

2.4 Chemical Composition

Ca 5(PO 4) 3(F,OH,Cl)Walter Schumann , Gemstones of the world (2001) More from other references

KAl3(SO4)2(OH)6

Apatite and Alunite Chemical Formula

While comparing Apatite and Alunite 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 Apatite and Alunite chemical formula.

Chemical formula of Apatite- Ca 5(PO 4) 3(F,OH,Cl)Walter Schumann , Gemstones of the world (2001) More from other references
Chemical formula of Alunite- KAl3(SO4)2(OH)6

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Apatite and Alunite Specific Gravity

Another important criteria for qualitative analysis of gemstones is Apatite and Alunite Specific gravity. Specific gravity is the relative density of a gemstone compared with respect to density of water. Gemologists use Apatite and Alunite Optical Properties during the identification of gemstone. Specific gravity of Apatite is 2.6-2.9 whereas that of Alunite is 2.6-2.9.