Amethyst and Achroite Physical Properties
Tenacity
Not Available
Not Available
Solubility
insoluble in common solvents
Not Available
Durability
Not Available
Not Available
Specific Gravity
2.65
2.90-3.40
Fracture
Conchoidal, ConchoidalWalter Schumann, Gemstones of the world (2001)
Uneven, Uneven, ConchoidalWalter Schumann, Gemstones of the world (2001)
Cleavage
Indiscernible
Not Available
Chemical Composition
SiO2
Na(Li 1.5Al 1.5)Al 6(Si 6O 18)(BO 3) 3(OH) 3(OH)Gemdat.org , Management Team (2012) Formula given for elbaite.
Amethyst and Achroite Chemical Formula
While comparing Amethyst and Achroite 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 Amethyst and Achroite chemical formula.
- Chemical formula of Amethyst- SiO2
- Chemical formula of Achroite- Na(Li 1.5Al 1.5)Al 6(Si 6O 18)(BO 3) 3(OH) 3(OH)Gemdat.org , Management Team (2012) Formula given for elbaite.
Amethyst and Achroite Specific Gravity
Another important criteria for qualitative analysis of gemstones is Amethyst and Achroite Specific gravity. Specific gravity is the relative density of a gemstone compared with respect to density of water. Gemologists use Amethyst and Achroite Optical Properties during the identification of gemstone. Specific gravity of Amethyst is 2.90-3.40 whereas that of Achroite is 2.90-3.40.