Cornetite
A variety of Minerals
What is Cornetite?
Cornetite is a phosphate of copper with hydroxyl named after the geologist Jules Cornet [fr]. It was discovered in 1917.
Market Value Factors
Pricing varies for every rock and mineral, so use these universal factors to gauge Cornetite before comparing listings or appraisals.
Size & Weight
Larger, intact specimens usually command higher prices.
Rarity & Demand
Scarce material or popular varieties sell at a premium.
Condition & Finish
Chips, repairs, and heavy wear lower value; clean prep helps.
Treatment & Provenance
Untreated specimens with documented locality are prized.
Cornetite Localities Map
See where Cornetite is found with a localities map, collecting zones, and geology context. Generate a sample map preview below.
Key Characteristics
Composition of Cornetite
Unlike related phases such as Pseudomalachite, the copper atoms are all five-fold coordinated by oxygen. There are three unique copper sites that are all quite distorted from ideal symmetry. Two are in approximate tetragonal pyramids and the third is essentially a trigonal bipyramidal coordination. Edge sharing polyhedra lead to copper-copper dimer formation, and the overall structure is a three-dimensional network of copper-oxygen polyhedra.
Quick Facts
Physical Properties
- Color
- Dark blue to green-blue; green-blue in transmitted light.
- Hardness (Mohs)
- 4.5
- Density
- 4.1 g/cm³
Chemical Properties
- Chemical Formula
- Cu3(PO4)(OH)3
- Elements
- Cu, H, O, P
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Cornetite FAQs
How do I identify Cornetite?
Cornetite can be identified by its hardness of 4.5 on the Mohs scale, Dark blue to green-blue; green-blue in transmitted light. color. Look for these key characteristics when examining specimens.
What color is Cornetite?
Cornetite typically appears in Dark blue to green-blue; green-blue in transmitted light.. Color can vary depending on impurities and formation conditions.
How hard is Cornetite?
Cornetite has a hardness of 4.5 on the Mohs scale. This gives it moderate hardness.
What is the composition of cornetite of Cornetite?
Unlike related phases such as Pseudomalachite, the copper atoms are all five-fold coordinated by oxygen. There are three unique copper sites that are all quite distorted from ideal symmetry. Two are in approximate tetragonal pyramids and the third is essentially a trigonal bipyramidal coordination. Edge sharing polyhedra lead to copper-copper dimer formation, and the overall structure is a three-dimensional network of copper-oxygen polyhedra.
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