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.

Geerite has a hardness of 3.5 - 4 on the Mohs scale. This gives it moderate hardness.

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.

Geerite Market Value Calculator

Estimate the market value of Geerite using size, quality, and finish. This preview calculator is for quick context and is not a formal appraisal.

Geerite Localities Map

See where Geerite is found with a localities map, collecting zones, and geology context. Generate a sample map preview below.

Map preview

North ZoneCentral RidgeSouth Basin

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.