This is simply a ridiculously large, SINGLE NATURAL LEAF FORMATION of silver! It is something you almost never see in such size, and probably came out of these rich lodes in their early days. From any location, its a uniquely large silver specimen for this style of silver formation. And, its just plain dramatic as heck. I did send it to the Seaman Museum to get confirmation of the locality (and it is surely Canadian because there is some attached cobaltite and nickeline; and not Michigan) .