Goethite and Howlite Physical Properties
Tenacity
Not Available
Not Available
Solubility
HCl soluble
Not Available
Durability
Not Available
Not Available
Specific Gravity
4.27-4.29
2.45-2.58
Fracture
Uneven, torn surfaces, (e.g. fractured metals)., Uneven, Gemstones (2009), torn surfaces, (e.g. fractured metals).
UnevenArthur Thomas, Gemstones (2009), UnevenArthur Thomas, Gemstones (2009), Brittle, Conchoidal
Cleavage
Perfect {010}
None
Mohs Hardness
5-5.5
3-3.5
Chemical Composition
FeO(OH)Arthur Thomas , Gemstones (2009)
Ca 2B 5SiO 9(OH) 5Michael OâDonoghue , Gems, Sixth Edition (2006) More from other references
Goethite and Howlite Chemical Formula
While comparing Goethite and Howlite 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 Howlite chemical formula.
- Chemical formula of Goethite- FeO(OH)Arthur Thomas , Gemstones (2009)
- Chemical formula of Howlite- Ca 2B 5SiO 9(OH) 5Michael OâDonoghue , Gems, Sixth Edition (2006) More from other references
Goethite and Howlite Specific Gravity
Another important criteria for qualitative analysis of gemstones is Goethite and Howlite Specific gravity. Specific gravity is the relative density of a gemstone compared with respect to density of water. Gemologists use Goethite and Howlite Optical Properties during the identification of gemstone. Specific gravity of Goethite is 2.45-2.58 whereas that of Howlite is 2.45-2.58.