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Rough 3-6+mm Bisbee Turquoise Nuggets from the Bob Mathew's bisbee Turquoise Collection. Bob was the only person to ever have a legal permit to mine is Turquoise in the Copper queen mine in Bisbee Arizona. These chips are mostly natural with a few pieces of stabilized. I have a limited amount left and this is authentic Bisbee Turquoise. 1 pound bags at $125 per bag is a gift to my customers.