Prehnite with Copper, Calcite, Quartz (1697) - image 1
Prehnite with Copper, Calcite, Quartz (1697) - image 2
specimen video

Prehnite with Copper, Calcite, Quartz (1697)

Unknown Owner
Outstanding example for the species from this area, light green botryoidal crystallized translucent prehnite is covering the top of this matrix with micro crystals of native copper, colorless calcite, and colorless quartz. In great condition. Previously in the noted collection of Russell MacFall.

Product details

Species
Copper, Prehnite, Calcite, QuartzAbout Copper →
SizeSmall Cabinet
Dimensions10.0 x 7.0 x 3.0 cm
Added on08/29/2025
Locality
USA, Michigan, Keweenaw PeninsulaRegional guide →

Known provenance

DateCollectorAcquisition price
05/2026Unknown Owner$1,300.00
—Weinrich MineralsNot disclosed

Learn more

Copper
Mineral guide
Learn about Copper
native copper with spinel-twinned crystals and arborescences; notable from Lake Superior, Itauz, Dongchuan, Corocoro, prized for color and localities.
Copper
Regional guide
Copper from Keweenaw Peninsula, Michigan, USA
The Keweenaw Peninsula is the classic native-copper locality: a place where copper was not merely an ore mineral locked in sulfides, but the metal itself—dense, malleable, and often sculptural—precipitated as copper, Cu, in billion-year-old volcanic rocks. For collectors, “Keweenaw copper” is a category unto itself. It can appear as wiry arborescent sprays, thick hackly sheets, crystal groups with sharp metallic faces, rounded glacial float nuggets, massive vein copper, copper-filled amygdules in basalt, and copper in conglomerate where the metal laces between volcanic pebbles.