Goethite and Calcite Physical Properties
Tenacity
Not Available
Brittle
Solubility
HCl soluble
Soluble
Durability
Not Available
Not Available
Specific Gravity
4.27-4.29
2.67-2.73
Fracture
Uneven, torn surfaces, (e.g. fractured metals)., Uneven, Gemstones (2009), torn surfaces, (e.g. fractured metals).
Conchoidal, ConchoidalArthur Thomas, Gemstones (2009), ConchoidalArthur Thomas, Gemstones (2009), Brittle, Conchoidal
Cleavage
Perfect {010}
Perfect on [10 1 1] three directions with angle of 74° 55
Chemical Composition
FeO(OH)Arthur Thomas , Gemstones (2009)
CaCO 3Ulrich Henn and Claudio C.
Goethite and Calcite Chemical Formula
While comparing Goethite and Calcite 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 Calcite chemical formula.
- Chemical formula of Goethite- FeO(OH)Arthur Thomas , Gemstones (2009)
- Chemical formula of Calcite- CaCO 3Ulrich Henn and Claudio C.
Goethite and Calcite Specific Gravity
Another important criteria for qualitative analysis of gemstones is Goethite and Calcite Specific gravity. Specific gravity is the relative density of a gemstone compared with respect to density of water. Gemologists use Goethite and Calcite Optical Properties during the identification of gemstone. Specific gravity of Goethite is 2.67-2.73 whereas that of Calcite is 2.67-2.73.