Fletcherite
A variety of Carrollite Subgroup
What is Fletcherite?
Fletcherite is a rare thiospinel sulfide mineral with formula Cu(Ni,Co)2S4. It is an opaque metallic steel gray mineral which crystallizes in the cubic crystal system. It is a member of the linnaeite group. It was first described in 1977 for an occurrence in the Fletcher Mine, Viburnum Trend (New Lead Belt), near Centerville, Reynolds County, Missouri. It occurs as a dissemination within copper sulfide minerals in mineralization replacing dolomite at the type locality in the Fletcher mine where it is associated with vaesite, pyrite, covellite, chalcopyrite, bornite and digenite. In an occurrence in Kalgoorlie, Australia it is found in black slate associated with pyrrhotite.
Market Value Factors
Pricing varies for every rock and mineral, so use these universal factors to gauge Fletcherite 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.
Fletcherite Localities Map
See where Fletcherite is found with a localities map, collecting zones, and geology context. Generate a sample map preview below.
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Quick Facts
Physical Properties
- Color
- Steel gray
- Hardness (Mohs)
- 5
- Density
- 4.76 g/cm³
Chemical Properties
- Chemical Formula
- Cu(Ni,Co)2S4
- Elements
- Co, Cu, Ni, S
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Fletcherite FAQs
How do I identify Fletcherite?
Fletcherite can be identified by its hardness of 5 on the Mohs scale, Steel gray color. Look for these key characteristics when examining specimens.
What color is Fletcherite?
Fletcherite typically appears in Steel gray. Color can vary depending on impurities and formation conditions.
How hard is Fletcherite?
Fletcherite has a hardness of 5 on the Mohs scale. This gives it moderate hardness.
