“The Dozer Conk” is a very rare Conk Opal. The wood areas which are filled with Opals have been eaten out by a fungus millions of years ago, then over the time fill up with Opal, that is it what makes this kind of Opal pattern so incredibly rare and only found in Virgin Valley Nevada. While preparing the bank to dig in, the Bulldozer drove over it and broke it into 3 pieces. This piece is one of those 3 broken pieces.