Sillimanite and Gedrite Physical Properties
Tenacity
Tough
Not Available
Solubility
Not Available
Not Available
Durability
Not Available
Not Available
Specific Gravity
3.20-3.26
3.15-3.259
Fracture
Splintery
Not Available
Cleavage
{010} perfect
Gedrite Magnesiogedrite , Comments: Dark gray cleavage fragment of magnesiogedrite (gedrite). , Location: Bamble, Telemark, Norway. , Scale: See Image.
Mohs Hardness
6-7.5
5.5-6
Chemical Composition
Al 2SiO 5Michael OâDonoghue , Gems, Sixth Edition (2006)
(Mg,Fe2+ ) 2[(Mg,Fe2+ ) 3Al 2](Si 6Al 2)O 22(OH) 2Anthony et al , Handbook of mineralogy (2001)
Sillimanite and Gedrite Chemical Formula
While comparing Sillimanite and Gedrite 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 Sillimanite and Gedrite chemical formula.
- Chemical formula of Sillimanite- Al 2SiO 5Michael OâDonoghue , Gems, Sixth Edition (2006)
- Chemical formula of Gedrite- (Mg,Fe2+ ) 2[(Mg,Fe2+ ) 3Al 2](Si 6Al 2)O 22(OH) 2Anthony et al , Handbook of mineralogy (2001)
Sillimanite and Gedrite Specific Gravity
Another important criteria for qualitative analysis of gemstones is Sillimanite and Gedrite Specific gravity. Specific gravity is the relative density of a gemstone compared with respect to density of water. Gemologists use Sillimanite and Gedrite Optical Properties during the identification of gemstone. Specific gravity of Sillimanite is 3.15-3.259 whereas that of Gedrite is 3.15-3.259.