Gahnite and Goethite Physical Properties
Tenacity
Not Available
Not Available
Solubility
Not Available
HCl soluble
Durability
Not Available
Not Available
Specific Gravity
4.00-4.62
4.27-4.29
Fracture
Conchoidal, Uneven
Uneven, torn surfaces, (e.g. fractured metals)., Uneven, Gemstones (2009), torn surfaces, (e.g. fractured metals).
Cleavage
Indistinct parting on [111]
Perfect {010}
Mohs Hardness
7.5-8
5-5.5
Chemical Composition
ZnAl 2O 4Michael OâDonoghue , Gems, Sixth Edition (2006)
FeO(OH)Arthur Thomas , Gemstones (2009)
Gahnite and Goethite Chemical Formula
While comparing Gahnite 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 Gahnite and Goethite chemical formula.
- Chemical formula of Gahnite- ZnAl 2O 4Michael OâDonoghue , Gems, Sixth Edition (2006)
- Chemical formula of Goethite- FeO(OH)Arthur Thomas , Gemstones (2009)
Gahnite and Goethite Specific Gravity
Another important criteria for qualitative analysis of gemstones is Gahnite and Goethite Specific gravity. Specific gravity is the relative density of a gemstone compared with respect to density of water. Gemologists use Gahnite and Goethite Optical Properties during the identification of gemstone. Specific gravity of Gahnite is 4.27-4.29 whereas that of Goethite is 4.27-4.29.