In the mines of Guanajuato, Mexico, when miners drill and dynamite for metallic ore, they dislodge other substances. Among these are elements and compounds known as “minerals,” sold and collected in their own right as scientific specimens or aesthetic collectibles. These minerals often fetch thousands of dollars at mineral shows and collector showrooms in Tucson, Arizona and other mineral collecting hubs. In this process, minerals move from byproducts and even waste to highly valued commodities in their own right.