Nephrite and Alunite Physical Properties
Tenacity
Not Available
Brittle
Solubility
Not Available
Soluble
Durability
Not Available
Not Available
Specific Gravity
2.90-3.10
2.6-2.9
Fracture
Splintery, Granular, Splintery, Granular, Gemstones (2009)
Conchoidal, Uneven
Cleavage
Not Available
On {0001}, perfect
Mohs Hardness
6-6.5
3.5-4
Chemical Composition
Ca 2(Mg,Fe) 5(OH) 2Walter Schumann , Gemstones of the world (2001) More from other references
KAl3(SO4)2(OH)6
Nephrite and Alunite Chemical Formula
While comparing Nephrite 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 Nephrite and Alunite chemical formula.
- Chemical formula of Nephrite- Ca 2(Mg,Fe) 5(OH) 2Walter Schumann , Gemstones of the world (2001) More from other references
- Chemical formula of Alunite- KAl3(SO4)2(OH)6
Nephrite and Alunite Specific Gravity
Another important criteria for qualitative analysis of gemstones is Nephrite and Alunite Specific gravity. Specific gravity is the relative density of a gemstone compared with respect to density of water. Gemologists use Nephrite and Alunite Optical Properties during the identification of gemstone. Specific gravity of Nephrite is 2.6-2.9 whereas that of Alunite is 2.6-2.9.