I purchased this specimen directly from a Mexican miner at Tucson. It is an amazing and totally unique (in my experience) blend of melted-looking acanthite crystals overlaying huge, robust polybasite crystals. The acanthites are smooth and look more like modern art, than the normal kind of acanthite crystallization we expect from here. It has crystals all around! Other than some contacting on the sides and bottom, it is mostly crystallized all around (with acanthite), although the polybasite matrix itself has some crystals that are not complete. Joe Budd photos.