Auction Win: Copper (arborescent branching) ex. Larry Cull Collection
Pickup available at Crystal Castle
Usually ready in 24 hours
Details
Locality: Keweenaw Peninsula, Michigan, USA
Size: Small Cabinet - 6.4 × 4.4 × 1.9 cm
Copper is a native-element mineral composed of Cu, crystallizing in the isometric system with distinctive arborescent branching. Its copper-red surface may tarnish black or green, while dendritic growth produces natural, tree-like forms from branching crystal skeletons. Copper is widely recognized for its essential role in electrical wiring.
The Keweenaw Peninsula of Michigan lies along the Midcontinent Rift and is renowned for the world’s largest concentration of native copper hosted chiefly in Precambrian flood basalts and interflow conglomerates. Known as “Copper Country,” it has produced exceptionally pure native copper along with silver, calcite, quartz, prehnite, epidote, chlorite, and zeolites. Commercial mining began in the 1840s and yielded billions of pounds of copper, making the district one of the premier sources of collectible copper specimens. Today, Keweenaw material remains highly prized for its distinctive native-copper forms and the region’s unparalleled geological and mining heritage.
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