Brookite and Alunite Physical Properties
Solubility
Not Available
Soluble
Durability
Not Available
Not Available
Specific Gravity
3.87-4.14
2.6-2.9
Fracture
Subconchoidal, ConchoidalArthur Thomas, Gemstones (2009), Conchoidal, Brittle
Conchoidal, Uneven
Cleavage
Poor on {120}, in traces on {001}
On {0001}, perfect
Mohs Hardness
5.5-6
3.5-4
Chemical Composition
TiO 2Michael OâDonoghue , Gems, Sixth Edition (2006) More from other references
KAl3(SO4)2(OH)6
Brookite and Alunite Chemical Formula
While comparing Brookite 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 Brookite and Alunite chemical formula.
- Chemical formula of Brookite- TiO 2Michael OâDonoghue , Gems, Sixth Edition (2006) More from other references
- Chemical formula of Alunite- KAl3(SO4)2(OH)6
Brookite and Alunite Specific Gravity
Another important criteria for qualitative analysis of gemstones is Brookite and Alunite Specific gravity. Specific gravity is the relative density of a gemstone compared with respect to density of water. Gemologists use Brookite and Alunite Optical Properties during the identification of gemstone. Specific gravity of Brookite is 2.6-2.9 whereas that of Alunite is 2.6-2.9.