Geerite
A variety of Minerals
What is Geerite?
Geerite is a copper sulfide mineral with the chemical formula Cu8S5. The mineral is named after the original collector, Adam Geer, of Utica, New York, US.
Market Value Factors
Pricing varies for every rock and mineral, so use these universal factors to gauge Geerite 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.
Geerite Localities Map
See where Geerite is found with a localities map, collecting zones, and geology context. Generate a sample map preview below.
Key Characteristics
Formation of Geerite
It was first described in 1980 for an occurrence as thin coatings or platelets replacing sphalerite in the type locality in De Kalb Township, Saint Lawrence County, New York. It also occurs in a magnetite–chromite a serpentinite-hosted deposit in Eretria, Greece. It occurs associated with spionkopite, sphalerite, tetrahedrite, chalcopyrite, malachite, azurite, brochantite, chrysocolla, cervantite, stibiconite, hemimorphite and calcite in the type locality; and with spionkopite, chalcopyrite, cobaltian pentlandite, magnetite, chromite, andradite, chlorite, diopside in the Eretria deposit. It has also been reported from a variety of locations worldwide, including the Logatchev-1 hydrothermal field along the Mid-Atlantic Ridge complex. It has been used to study crystal structure and bonding in copper sulfides.
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Quick Facts
Physical Properties
- Hardness (Mohs)
- 3.5 - 4
- Density
- 5.61 g/cm³
Chemical Properties
- Chemical Formula
- Cu8S5 "Extended" formula is Cu+6Cu2+2S5 (Goble, 1985).
- Elements
- Cu, S
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Geerite FAQs
How do I identify Geerite?
Geerite can be identified by its hardness of 3.5 - 4 on the Mohs scale. Look for these key characteristics when examining specimens.
How hard is Geerite?
Geerite has a hardness of 3.5 - 4 on the Mohs scale. This gives it moderate hardness.
What is the formation of geerite of Geerite?
It was first described in 1980 for an occurrence as thin coatings or platelets replacing sphalerite in the type locality in De Kalb Township, Saint Lawrence County, New York. It also occurs in a magnetite–chromite a serpentinite-hosted deposit in Eretria, Greece. It occurs associated with spionkopite, sphalerite, tetrahedrite, chalcopyrite, malachite, azurite, brochantite, chrysocolla, cervantite, stibiconite, hemimorphite and calcite in the type locality; and with spionkopite, chalcopyrite, cobaltian pentlandite, magnetite, chromite, andradite, chlorite, diopside in the Eretria deposit. It has also been reported from a variety of locations worldwide, including the Logatchev-1 hydrothermal field along the Mid-Atlantic Ridge complex. It has been used to study crystal structure and bonding in copper sulfides.
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