Alunite and Fluorite Physical Properties

Alunite

Fluorite

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1 Physical Properties

1.1 Tenacity

Brittle

1.2 Solubility

Soluble

slightly water soluble and in hot hydrochloric acid

1.3 Durability

Not Available

1.4 Specific Gravity

2.6-2.93.00-3.25

1 7.18

1.5 Fracture

Conchoidal, Uneven

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

1.6 Cleavage

On {0001}, perfect

Octahedral, perfect on {111}, parting on {011}

1.7 Mohs Hardness

3.5-44

2 10

1.8 Chemical Composition

KAl3(SO4)2(OH)6

CaF₂

Alunite and Fluorite Chemical Formula

While comparing Alunite and Fluorite 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 Fluorite chemical formula.

Chemical formula of Alunite- KAl3(SO4)2(OH)6
Chemical formula of Fluorite- CaF₂

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Alunite and Fluorite Specific Gravity

Another important criteria for qualitative analysis of gemstones is Alunite and Fluorite Specific gravity. Specific gravity is the relative density of a gemstone compared with respect to density of water. Gemologists use Alunite and Fluorite Optical Properties during the identification of gemstone. Specific gravity of Alunite is 3.00-3.25 whereas that of Fluorite is 3.00-3.25.