I believe that this specimen represents a very rare phase and form in gold, octahedral hopper crystal growth: you can see clearly the octahedral outline of a mammoth gold crystal here, but since it is unlikely to have formed as a cast OVER another large ocohedral mineral the octo is surely the form of the gold itself, albeit hoppered and incompletely formed on all sides. In person, the shape is quite evident and I believe this to be a significant piece for this reason. Its size and weight of 3.5 ounces/ 108 grams, along with its apparent octohedral form, make this piece extremely desirable.