Andalusite and Gahnite Physical Properties
Tenacity
Not Available
Not Available
Solubility
Not Available
Not Available
Durability
Not Available
Not Available
Specific Gravity
3.05-3.21
4.00-4.62
Fracture
Uneven, Subconchoidal, Uneven, Subconchoidal, Splintery, UnevenArthur Thomas, Gemstones (2009)
Conchoidal, Uneven
Cleavage
Good on {110}, poor on {100}
Indistinct parting on [111]
Chemical Composition
Al 2SiO 5Michael OâDonoghue , Gems, Sixth edition (2006) More from other references
ZnAl 2O 4Michael OâDonoghue , Gems, Sixth Edition (2006)
Andalusite and Gahnite Chemical Formula
While comparing Andalusite and Gahnite 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 Andalusite and Gahnite chemical formula.
- Chemical formula of Andalusite- Al 2SiO 5Michael OâDonoghue , Gems, Sixth edition (2006) More from other references
- Chemical formula of Gahnite- ZnAl 2O 4Michael OâDonoghue , Gems, Sixth Edition (2006)
Andalusite and Gahnite Specific Gravity
Another important criteria for qualitative analysis of gemstones is Andalusite and Gahnite Specific gravity. Specific gravity is the relative density of a gemstone compared with respect to density of water. Gemologists use Andalusite and Gahnite Optical Properties during the identification of gemstone. Specific gravity of Andalusite is 4.00-4.62 whereas that of Gahnite is 4.00-4.62.