Bustamite and Sillimanite Physical Properties
Tenacity
Not Available
Tough
Solubility
Partly soluble in HCl.
Not Available
Durability
Not Available
Not Available
Specific Gravity
3.32-3.43
3.20-3.26
Fracture
ConchoidalArthur Thomas, Gemstones (2009), ConchoidalArthur Thomas, Gemstones (2009)
Splintery
Cleavage
{100} perfect; {110} and {1 1 0} good; {010} poor
{010} perfect
Mohs Hardness
5.5-6
6-7.5
Chemical Composition
(Ca,Mn2+ )Si 3O 9Michael OâDonoghue , Gems, Sixth Edition (2006) More from other references
Al 2SiO 5Michael OâDonoghue , Gems, Sixth Edition (2006)
Bustamite and Sillimanite Chemical Formula
While comparing Bustamite and Sillimanite 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 Bustamite and Sillimanite chemical formula.
- Chemical formula of Bustamite- (Ca,Mn2+ )Si 3O 9Michael OâDonoghue , Gems, Sixth Edition (2006) More from other references
- Chemical formula of Sillimanite- Al 2SiO 5Michael OâDonoghue , Gems, Sixth Edition (2006)
Bustamite and Sillimanite Specific Gravity
Another important criteria for qualitative analysis of gemstones is Bustamite and Sillimanite Specific gravity. Specific gravity is the relative density of a gemstone compared with respect to density of water. Gemologists use Bustamite and Sillimanite Optical Properties during the identification of gemstone. Specific gravity of Bustamite is 3.20-3.26 whereas that of Sillimanite is 3.20-3.26.