Feodosiyite
A variety of Minerals
What is Feodosiyite?
Feodosiyite is a very rare chloride mineral, just recently approved, with the formula Cu11Mg2Cl18(OH)8•16H2O. Its structure is unique. Feodosiyite comes from the Tolbachik volcano, famous for many rare fumarolic minerals. Chemically similar minerals, chlorides containing both copper and magnesium, include haydeeite, paratacamite-(Mg) and tondiite.
Market Value Factors
Pricing varies for every rock and mineral, so use these universal factors to gauge Feodosiyite 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.
Feodosiyite Localities Map
See where Feodosiyite is found with a localities map, collecting zones, and geology context. Generate a sample map preview below.
Quick Facts
Physical Properties
- Color
- Bright green
- Hardness (Mohs)
- 3
- Density
- 2.563 g/cm³
Chemical Properties
- Chemical Formula
- Cu11Mg2Cl18(OH)8·16H2O
- Elements
- Cl, Cu, H, Mg, O
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Feodosiyite FAQs
How do I identify Feodosiyite?
Feodosiyite can be identified by its hardness of 3 on the Mohs scale, Bright green color. Look for these key characteristics when examining specimens.
What color is Feodosiyite?
Feodosiyite typically appears in Bright green. Color can vary depending on impurities and formation conditions.
How hard is Feodosiyite?
Feodosiyite has a hardness of 3 on the Mohs scale. This makes it a soft mineral that can be scratched easily.
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