Alunite and Cinnabar Physical Properties
Tenacity
Brittle
Slightly sectile
Solubility
Soluble
1.04 x 10−25 g per 100 ml water (Ksp at 25°C = 2 x 10−32)
Durability
Not Available
Not Available
Specific Gravity
2.6-2.9
2
Fracture
Conchoidal, Uneven
Uneven, Uneven, Gemstones (2009), Brittle
Cleavage
On {0001}, perfect
Prismatic {10 1 0}, perfect
Mohs Hardness
3.5-4
2-2.5
Chemical Composition
KAl3(SO4)2(OH)6
HgSMichael OâDonoghue , Gems, Sixth Edition (2006) More from other references
Alunite and Cinnabar Chemical Formula
While comparing Alunite and Cinnabar 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 Cinnabar chemical formula.
- Chemical formula of Alunite- KAl3(SO4)2(OH)6
- Chemical formula of Cinnabar- HgSMichael OâDonoghue , Gems, Sixth Edition (2006) More from other references
Alunite and Cinnabar Specific Gravity
Another important criteria for qualitative analysis of gemstones is Alunite and Cinnabar Specific gravity. Specific gravity is the relative density of a gemstone compared with respect to density of water. Gemologists use Alunite and Cinnabar Optical Properties during the identification of gemstone. Specific gravity of Alunite is 2 whereas that of Cinnabar is 2.