Andalusite and Spinel Physical Properties
Tenacity
Not Available
Not Available
Solubility
Not Available
none
Durability
Not Available
Not Available
Specific Gravity
3.05-3.21
3.64-3.66
Fracture
Uneven, Subconchoidal, Uneven, Subconchoidal, Splintery, UnevenArthur Thomas, Gemstones (2009)
Conchoidal, Uneven, ConchoidalArthur Thomas, Gemstones (2009)
Cleavage
Good on {110}, poor on {100}
None, but may exhibit slight parting
Chemical Composition
Al 2SiO 5Michael OâDonoghue , Gems, Sixth edition (2006) More from other references
MgAl2O4
Andalusite and Spinel Chemical Formula
While comparing Andalusite and Spinel 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 Spinel chemical formula.
- Chemical formula of Andalusite- Al 2SiO 5Michael OâDonoghue , Gems, Sixth edition (2006) More from other references
- Chemical formula of Spinel- MgAl2O4
Andalusite and Spinel Specific Gravity
Another important criteria for qualitative analysis of gemstones is Andalusite and Spinel Specific gravity. Specific gravity is the relative density of a gemstone compared with respect to density of water. Gemologists use Andalusite and Spinel Optical Properties during the identification of gemstone. Specific gravity of Andalusite is 3.64-3.66 whereas that of Spinel is 3.64-3.66.