Emanating from a central spine which itself is a giant, elongated spinel twinned copper crystal, are a series of parallel growth copper spinel-twins to 1.75 cm in length. The crystals have a patina colored a rich brownish-red (untouched by acidizing) with the brighter red probably representing a thin coating of cuprite. In cross section, the specimen resembles a forest or a fishbone. Architecturally, this looks a lot like a fish skeleton and so you can see why the nickname "herringbone coppers" has been attached to these. Striking specimen, and a very stylish old classic. Out of all the Michigan coppers, this is really one of the few styles totally unique and recognizable to one specific mine.