{"product_id":"native-copper-218","title":"NATIVE COPPER","description":"This classic Michigan Native Copper comes from the La Salle mine, near Osceola Township, Houghton County. This underground copper mine consisted of two shafts that worked the Kearsarge Lode just south of Calumet. Production was from 1910 to 1920, resulting in 3.6 million tons of copper. In terms of mineral specimens La Salle mine is not seen as often as many of the other mines in the vicinity making this miniature crystallized Native Copper specimen a nice proposition. With a slightly rough, pitted texture, the Native Copper forms one very large crystal, or blocky crystal group, with slightly rounded faces, with other smaller crystals on top and a more hackly, spongey-textured mass of Native Copper along its base, with a brick-red colour perhaps indicative of partial alteration to copper oxide (Cuprite). The shimmering bright metallic orange colour of the surfaces of the main crystal allows its crystal faces to be studied, as the light reflects at different angles. Ex David Hardman Collection, no. 3603.","brand":"Crystal Classics","offers":[{"title":"Default Title","offer_id":59453290578255,"sku":"CC58886","price":671.0,"currency_code":"GBP","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/1011\/3748\/2063\/files\/CC58886.jpg?v=1794355376","url":"https:\/\/crystalclassics.co.uk\/products\/native-copper-218","provider":"Crystal Classics UK","version":"1.0","type":"link"}