Alunite and Apatite Physical Properties
Tenacity
Brittle
Not Available
Solubility
Soluble
Not Available
Durability
Not Available
Not Available
Specific Gravity
2.6-2.9
3.16-3.23
Fracture
Conchoidal, Uneven
Conchoidal, Uneven, Conchoidal, Brittle, ConchoidalArthur Thomas, Gemstones (2009), Conchoidal to uneven
Cleavage
On {0001}, perfect
[0001] indistinct, [1010] indistinct
Chemical Composition
KAl3(SO4)2(OH)6
Ca 5(PO 4) 3(F,OH,Cl)Walter Schumann , Gemstones of the world (2001) More from other references
Alunite and Apatite Chemical Formula
While comparing Alunite and Apatite 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 Apatite chemical formula.
- Chemical formula of Alunite- KAl3(SO4)2(OH)6
- Chemical formula of Apatite- Ca 5(PO 4) 3(F,OH,Cl)Walter Schumann , Gemstones of the world (2001) More from other references
Alunite and Apatite Specific Gravity
Another important criteria for qualitative analysis of gemstones is Alunite and Apatite Specific gravity. Specific gravity is the relative density of a gemstone compared with respect to density of water. Gemologists use Alunite and Apatite Optical Properties during the identification of gemstone. Specific gravity of Alunite is 3.16-3.23 whereas that of Apatite is 3.16-3.23.