Anderson will share some of his stories at the Gem, Mineral & Fossil Show – put on by the Black Hawk Gem & Mineral Society – at the Waterloo Center for the Arts, 225 Commercial St., on Sunday. The ...

Amethyst is a violet variety of quartz that has been used as a gemstone for many centuries and is a key economic resource in northern Uruguay. Geodes are hollow rock formations often with quartz ...