Alunite and Dumortierite Physical Properties

Alunite

Dumortierite

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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

2.6-2.93.26-3.41

1 7.18

1.5 Fracture

Conchoidal, Uneven

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

1.6 Cleavage

On {0001}, perfect

Distinct on {100}, poor on {110}; parting on {001}

1.7 Mohs Hardness

3.5-47-8.5

2 10

1.8 Chemical Composition

KAl3(SO4)2(OH)6

AlAl₆O₃BSi₃O₁₈

Alunite and Dumortierite Chemical Formula

While comparing Alunite and Dumortierite 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 Dumortierite chemical formula.

Chemical formula of Alunite- KAl3(SO4)2(OH)6
Chemical formula of Dumortierite- AlAl₆O₃BSi₃O₁₈

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Alunite and Dumortierite Specific Gravity

Another important criteria for qualitative analysis of gemstones is Alunite and Dumortierite Specific gravity. Specific gravity is the relative density of a gemstone compared with respect to density of water. Gemologists use Alunite and Dumortierite Optical Properties during the identification of gemstone. Specific gravity of Alunite is 3.26-3.41 whereas that of Dumortierite is 3.26-3.41.