Kröhnkite
A variety of Minerals
What is Kröhnkite?
Kröhnkite ( Na2Cu(SO4)2•2H2O ) is a rare copper sulfate mineral named after B. Kröhnke who first researched it. Kröhnkite may be replaced by Saranchinaite, the anhydrous form of the mineral, if heated to temperatures above 200 °C (392 °F)
Market Value Factors
Pricing varies for every rock and mineral, so use these universal factors to gauge Kröhnkite 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.
Kröhnkite Localities Map
See where Kröhnkite is found with a localities map, collecting zones, and geology context. Generate a sample map preview below.
Key Characteristics
Formation of Kröhnkite
Kröhnkite was first researched after an occurrence in the Chuquicamata Mine, Chile, and has been reported from a number of locations in the Atacama region. Associated minerals in the discovery location include atacamite, blodite, chalcanthite, antlerite and natrochalcite. It occurs in the oxidized zone of copper deposits in arid environments.
Quick Facts
Physical Properties
- Color
- Blue, greenish-blue; light blue to colourless in transmitted light
- Hardness (Mohs)
- 2.5 - 3
- Density
- 2.95 g/cm³
- Streak
- White
Chemical Properties
- Chemical Formula
- Na2Cu(SO4)2 · 2H2O
- Elements
- Cu, H, Na, O, S
Also Known As
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Kröhnkite FAQs
How do I identify Kröhnkite?
Kröhnkite can be identified by its hardness of 2.5 - 3 on the Mohs scale, Blue color. Look for these key characteristics when examining specimens.
What color is Kröhnkite?
Kröhnkite typically appears in Blue, greenish-blue; light blue to colourless in transmitted light. Color can vary depending on impurities and formation conditions.
How hard is Kröhnkite?
Kröhnkite has a hardness of 2.5 - 3 on the Mohs scale. This makes it a soft mineral that can be scratched easily.
What is the formation of kröhnkite of Kröhnkite?
Kröhnkite was first researched after an occurrence in the Chuquicamata Mine, Chile, and has been reported from a number of locations in the Atacama region. Associated minerals in the discovery location include atacamite, blodite, chalcanthite, antlerite and natrochalcite. It occurs in the oxidized zone of copper deposits in arid environments.
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