三州矿区
USA
横跨密苏里、堪萨斯与奥克拉荷马三州的三州矿区(乔普林–皮彻地区),曾是世界重要的铅锌矿带,在收藏界以大型光亮方铅矿立方体与琥珀色『红宝石杰克』闪锌矿闻名。
A classic Mississippi-Valley-type lead–zinc field
The Tri-State district, centred on Joplin, Missouri and Picher, Oklahoma, was a major lead and zinc producer into the 20th century. Its Mississippi-Valley-type ore bodies, hosted in cherty limestone, yielded exceptionally well-crystallised sulfides and carbonates.
What collectors look for
Sharp, bright galena cubes and cubo-octahedra, gemmy amber-to-red "ruby jack" sphalerite, and associated calcite, dolomite, chalcopyrite, and marcasite are the signature Tri-State specimens.