Mineral guide

Learn about Quartz

a versatile mineral with clear, milky, and colored varieties; crystal forms, formation clues, and tips for identifying amethyst and citrine.

Regional guide

Quartz from Yaogangxian Mine, China

Yaogangxian Mine quartz, China — famed for pale quartz with purple fluorite cubes set in a tungsten-tin hydrothermal system; a premier locality for collectors.

Locality guide

Yaogangxian Mine

A collector's guide to Yaogangxian Mine, China: its geology, mining history and notable minerals, illustrated with the 1584 specimens documented from this locality on EarthWonders.