Bustamite and Alunite Physical Properties
Tenacity
Not Available
Brittle
Solubility
Partly soluble in HCl.
Soluble
Durability
Not Available
Not Available
Specific Gravity
3.32-3.43
2.6-2.9
Fracture
ConchoidalArthur Thomas, Gemstones (2009), ConchoidalArthur Thomas, Gemstones (2009)
Conchoidal, Uneven
Cleavage
{100} perfect; {110} and {1 1 0} good; {010} poor
On {0001}, perfect
Mohs Hardness
5.5-6
3.5-4
Chemical Composition
(Ca,Mn2+ )Si 3O 9Michael OâDonoghue , Gems, Sixth Edition (2006) More from other references
KAl3(SO4)2(OH)6
Bustamite and Alunite Chemical Formula
While comparing Bustamite 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 Bustamite and Alunite chemical formula.
- Chemical formula of Bustamite- (Ca,Mn2+ )Si 3O 9Michael OâDonoghue , Gems, Sixth Edition (2006) More from other references
- Chemical formula of Alunite- KAl3(SO4)2(OH)6
Bustamite and Alunite Specific Gravity
Another important criteria for qualitative analysis of gemstones is Bustamite and Alunite Specific gravity. Specific gravity is the relative density of a gemstone compared with respect to density of water. Gemologists use Bustamite and Alunite Optical Properties during the identification of gemstone. Specific gravity of Bustamite is 2.6-2.9 whereas that of Alunite is 2.6-2.9.