Lots of kids collect minerals, but Richard Berger wasn’t one of them. The Bronx native didn’t see his first chunk of quartz until he was in his 20s. Disillusioned with medical school, Berger was ...

Amethyst is a violet variety of quartz which 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 ...