{"product_id":"chalcocite-with-calcite-and-quartz","title":"CHALCOCITE   with CALCITE and QUARTZ","description":"The Bristol Copper mine in Hartford County, Connecticut, USA, produced world-class specimens of Chalcocite and Bornite during its life, where mining began as early as 1837.  Such specimens are now held in some of the major museums, Yale-Peabody being one.  As far as I know, specimens from this mine are hardly ever seen in private collections and very seldom made available for sale.  This beautifully crystallised Chalcocite is from the Dr Josef Clemente (1899-1987) Collection of southern Germany, a collection which lay dormant for the last 36 years and is now yielding classic material such as this.  On this small miniature, sharp, superbly defined crystals of sooty-black Chalcocite cover a massive, almost totally hidden Chalcocite matrix with overgrowths of bright, milky-white scalenohedral Calcite crystals and a little Quartz.  The Chalcocite forms striated tabular crystals to about 7 mm tall, with chisel-shaped terminations and a powder-like textured surface of sooty Chalcocite.  Such a surface layer is occasionally observed on Chalcocite, a feature which makes this rare specimen all the more interesting.  This is a rare opportunity to acquire a fine and historic specimen from the Bristol Copper mine in Connecticut.","brand":"Crystal Classics","offers":[{"title":"Default Title","offer_id":57781138456911,"sku":"CC21188","price":1110.0,"currency_code":"GBP","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/1011\/3748\/2063\/files\/CC21188_e2807d6e-5b35-4d48-95df-79ae4ed6bac5.jpg?v=1783978990","url":"https:\/\/crystalclassics.co.uk\/products\/chalcocite-with-calcite-and-quartz","provider":"Crystal Classics UK","version":"1.0","type":"link"}