Andalusite and Star Sapphire Physical Properties
Tenacity
Not Available
Not Available
Solubility
Not Available
Not Available
Durability
Not Available
Not Available
Specific Gravity
3.05-3.21
3.90-4.05
Fracture
Uneven, Subconchoidal, Uneven, Subconchoidal, Splintery, UnevenArthur Thomas, Gemstones (2009)
Not Available
Cleavage
Good on {110}, poor on {100}
Not Available
Mohs Hardness
7.5
Not Available
Chemical Composition
Al 2SiO 5Michael OâDonoghue , Gems, Sixth edition (2006) More from other references
Al 2O 3Ulrich Henn and Claudio C.
Andalusite and Star Sapphire Chemical Formula
While comparing Andalusite and Star Sapphire 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 Star Sapphire chemical formula.
- Chemical formula of Andalusite- Al 2SiO 5Michael OâDonoghue , Gems, Sixth edition (2006) More from other references
- Chemical formula of Star Sapphire- Al 2O 3Ulrich Henn and Claudio C.
Andalusite and Star Sapphire Specific Gravity
Another important criteria for qualitative analysis of gemstones is Andalusite and Star Sapphire Specific gravity. Specific gravity is the relative density of a gemstone compared with respect to density of water. Gemologists use Andalusite and Star Sapphire Optical Properties during the identification of gemstone. Specific gravity of Andalusite is 3.90-4.05 whereas that of Star Sapphire is 3.90-4.05.