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Prehnite

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Metallic crystals of chalcocite to 0.1 cm in size scattered richly across the top of a botryoidal green prehnite crystal matrix. In good condition. A neat thumbnail specimen for this mining district.

Product details

SpeciesPrehniteChalcocite
SizeMiniature
Dimensions3.0 x 2.3 x 2.0 cm
Added on05/27/2026
LocalityClark Mine, Keweenaw Co., Michigan, USA

Current owner

Unknown Owner
Acquired
Oct 2026

Previous owners

DateCollectorAcquisition price
—Weinrich MineralsNot disclosed

Learn more

Prehnite
Mineral guide
Learn about Prehnite
apple- to mint-green crystals and sculptural botryoidal/rosette forms; a calcium aluminum silicate formed in low-temp hydrothermal environments.