Amethyst and Andalusite Physical Properties
Tenacity
Not Available
Not Available
Solubility
insoluble in common solvents
Not Available
Durability
Not Available
Not Available
Specific Gravity
2.65
3.05-3.21
Fracture
Conchoidal, ConchoidalWalter Schumann, Gemstones of the world (2001)
Uneven, Subconchoidal, Uneven, Subconchoidal, Splintery, UnevenArthur Thomas, Gemstones (2009)
Cleavage
Indiscernible
Good on {110}, poor on {100}
Chemical Composition
SiO2
Al 2SiO 5Michael OâDonoghue , Gems, Sixth edition (2006) More from other references
Amethyst and Andalusite Chemical Formula
While comparing Amethyst and Andalusite 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 Andalusite chemical formula.
- Chemical formula of Amethyst- SiO2
- Chemical formula of Andalusite- Al 2SiO 5Michael OâDonoghue , Gems, Sixth edition (2006) More from other references
Amethyst and Andalusite Specific Gravity
Another important criteria for qualitative analysis of gemstones is Amethyst and Andalusite Specific gravity. Specific gravity is the relative density of a gemstone compared with respect to density of water. Gemologists use Amethyst and Andalusite Optical Properties during the identification of gemstone. Specific gravity of Amethyst is 3.05-3.21 whereas that of Andalusite is 3.05-3.21.