Andalusite and Prehnite Physical Properties
Tenacity
Not Available
Brittle
Solubility
Not Available
Not Available
Durability
Not Available
Not Available
Specific Gravity
3.05-3.21
2.80-2.95
Fracture
Uneven, Subconchoidal, Uneven, Subconchoidal, Splintery, UnevenArthur Thomas, Gemstones (2009)
Uneven, Yellow, White, UnevenWalter Schumann, Gemstones of the world (2001) More from other references, Brittle, Metallic
Cleavage
Good on {110}, poor on {100}
Distinct on [001]
Chemical Composition
Al 2SiO 5Michael OâDonoghue , Gems, Sixth edition (2006) More from other references
Ca2Al2Si3O12(OH)
Andalusite and Prehnite Chemical Formula
While comparing Andalusite and Prehnite 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 Prehnite chemical formula.
- Chemical formula of Andalusite- Al 2SiO 5Michael OâDonoghue , Gems, Sixth edition (2006) More from other references
- Chemical formula of Prehnite- Ca2Al2Si3O12(OH)
Andalusite and Prehnite Specific Gravity
Another important criteria for qualitative analysis of gemstones is Andalusite and Prehnite Specific gravity. Specific gravity is the relative density of a gemstone compared with respect to density of water. Gemologists use Andalusite and Prehnite Optical Properties during the identification of gemstone. Specific gravity of Andalusite is 2.80-2.95 whereas that of Prehnite is 2.80-2.95.