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Alunite
Alunite

Almandine
Almandine



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Alunite and Almandine Physical Properties

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1 Physical Properties
1.1 Tenacity
Brittle
Not Available
1.2 Solubility
Soluble
Not Available
1.3 Durability
Not Available
Not Available
1.4 Specific Gravity
2.6-2.9
3.95-4.30
1.5 Fracture
Conchoidal, Uneven
Conchoidal, Brittle, Conchoidal, Brittle, Conchoidal, ConchoidalArthur Thomas, Gemstones (2009), Brittle, Conchoidal
1.6 Cleavage
On {0001}, perfect
none
1.7 Mohs Hardness
3.5-4
7-7.5
1.8 Chemical Composition
KAl3(SO4)2(OH)6
Fe 3Al 2(SiO 4) 3Arthur Thomas , Gemstones (2009)

Alunite and Almandine Chemical Formula

While comparing Alunite and Almandine 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 Almandine chemical formula.

  • Chemical formula of Alunite- KAl3(SO4)2(OH)6
  • Chemical formula of Almandine- Fe 3Al 2(SiO 4) 3Arthur Thomas , Gemstones (2009)

Alunite and Almandine Specific Gravity

Another important criteria for qualitative analysis of gemstones is Alunite and Almandine Specific gravity. Specific gravity is the relative density of a gemstone compared with respect to density of water. Gemologists use Alunite and Almandine Optical Properties during the identification of gemstone. Specific gravity of Alunite is 3.95-4.30 whereas that of Almandine is 3.95-4.30.