Goethite and Pyrophyllite Physical Properties
Tenacity
Not Available
Not Available
Solubility
HCl soluble
Not Available
Durability
Not Available
Not Available
Specific Gravity
4.27-4.29
2.65-2.90
Fracture
Uneven, torn surfaces, (e.g. fractured metals)., Uneven, Gemstones (2009), torn surfaces, (e.g. fractured metals).
Gemstones (2009), Flexible Flexible fragments.
Cleavage
Perfect {010}
{001} Perfect
Mohs Hardness
5-5.5
Not Available
Chemical Composition
FeO(OH)Arthur Thomas , Gemstones (2009)
Al 2Si 4O 10(OH) 2Michael OâDonoghue , Gems, Sixth Edition (2006) More from other references
Goethite and Pyrophyllite Chemical Formula
While comparing Goethite and Pyrophyllite 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 Goethite and Pyrophyllite chemical formula.
- Chemical formula of Goethite- FeO(OH)Arthur Thomas , Gemstones (2009)
- Chemical formula of Pyrophyllite- Al 2Si 4O 10(OH) 2Michael OâDonoghue , Gems, Sixth Edition (2006) More from other references
Goethite and Pyrophyllite Specific Gravity
Another important criteria for qualitative analysis of gemstones is Goethite and Pyrophyllite Specific gravity. Specific gravity is the relative density of a gemstone compared with respect to density of water. Gemologists use Goethite and Pyrophyllite Optical Properties during the identification of gemstone. Specific gravity of Goethite is 2.65-2.90 whereas that of Pyrophyllite is 2.65-2.90.