Common Opal and Goethite Physical Properties
Tenacity
Not Available
Not Available
Solubility
Not Available
HCl soluble
Durability
Not Available
Not Available
Specific Gravity
1.98-2.50
4.27-4.29
Fracture
Conchoidal, Conchoidal, Gemstones of the world (2001)
Uneven, torn surfaces, (e.g. fractured metals)., Uneven, Gemstones (2009), torn surfaces, (e.g. fractured metals).
Cleavage
Not Available
Perfect {010}
Mohs Hardness
5.5-6.5
5-5.5
Chemical Composition
SiO 2 · nH 2OWalter Schumann , Gemstones of the world (2001)
FeO(OH)Arthur Thomas , Gemstones (2009)
Common Opal and Goethite Chemical Formula
While comparing Common Opal 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 Common Opal and Goethite chemical formula.
- Chemical formula of Common Opal- SiO 2 · nH 2OWalter Schumann , Gemstones of the world (2001)
- Chemical formula of Goethite- FeO(OH)Arthur Thomas , Gemstones (2009)
Common Opal and Goethite Specific Gravity
Another important criteria for qualitative analysis of gemstones is Common Opal and Goethite Specific gravity. Specific gravity is the relative density of a gemstone compared with respect to density of water. Gemologists use Common Opal and Goethite Optical Properties during the identification of gemstone. Specific gravity of Common Opal is 4.27-4.29 whereas that of Goethite is 4.27-4.29.