Chalcedonies include many types of cryptocrystalline quartz gems and feature a number of different colors. Geologists can tell a chalcedony from the arrangement and structure of its crystals.

Take a leisurely hike along one of the many scenic trails ... seek out the hidden gems of America. The colors of autumn truly shine. From the peaceful forests of the Great Smoky Mountains to ...

Its red and green colors were similar to the national ... Throughout centuries, many cultures associated the gem with the moon. According to Hindu mythology, it was believed moonstone was made ...