Sillimanite and Goethite Physical Properties
Tenacity
Tough
Not Available
Solubility
Not Available
HCl soluble
Durability
Not Available
Not Available
Specific Gravity
3.20-3.26
4.27-4.29
Fracture
Splintery
Uneven, torn surfaces, (e.g. fractured metals)., Uneven, Gemstones (2009), torn surfaces, (e.g. fractured metals).
Cleavage
{010} perfect
Perfect {010}
Mohs Hardness
6-7.5
5-5.5
Chemical Composition
Al 2SiO 5Michael OâDonoghue , Gems, Sixth Edition (2006)
FeO(OH)Arthur Thomas , Gemstones (2009)
Sillimanite and Goethite Chemical Formula
While comparing Sillimanite and Goethite 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 Goethite chemical formula.
- Chemical formula of Sillimanite- Al 2SiO 5Michael OâDonoghue , Gems, Sixth Edition (2006)
- Chemical formula of Goethite- FeO(OH)Arthur Thomas , Gemstones (2009)
Sillimanite and Goethite Specific Gravity
Another important criteria for qualitative analysis of gemstones is Sillimanite and Goethite Specific gravity. Specific gravity is the relative density of a gemstone compared with respect to density of water. Gemologists use Sillimanite and Goethite Optical Properties during the identification of gemstone. Specific gravity of Sillimanite is 4.27-4.29 whereas that of Goethite is 4.27-4.29.