Copper ps. Laumontite
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An exceedingly rare pseudomorph from the Cliff Mine in the Upper Peninsula Michigan featuring native copper replacing blocky crystals of laumontite. These pieces are exceedingly rare and hardly ever available, and usually poorly formed or jumbled in a mass of copper. If you collect pseudomorphs or minerals from Michigan Copper Country, this is something unique, special and rare that you're not likely to find anywhere else. Several copper pseudomorphs are present on the piece that average 1 cm in size and display a dark patina. Minor amounts of small, copper dendrites to 5 mm can be seen scattered on the piece as well. A fantastic rarity, and a great piece to round out any suite of minerals from this prolific copper-producing region. John Kassionas was an early pseudomorph collector based in California, and I heard about this collection but never saw it intact (assembled in the 1960s-70s, mostly). It then went to Brad van Scriver, to Ross Lillie in Michigan, and then to the Young's. Illustrated in Collecting Pseudomorphs: The Changelings of Mineralogy (Mineralogical Record, Jan 2025) on page 92. Also illustrated in ExtraLapis #43: Pseudomorphs. Comes with a custom lucite display base. Laszlo Kupi photo.
Product details
SpeciesCopper, Laumontite
SizeSmall Cabinet
Dimensions6.7 x 5.0 x 4.0 cm
Listed on08/15/2025
SKUSYP25-30
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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.Regional guide
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