Many minerals form beautiful crystals, but the most prized of all ... and emeralds continue to qualify as "precious." (At one time, amethyst was also considered a precious gem, but large reserves ...

Geology is the study of the earth: its composition, history, and the forces that act on it. One’s interest in geology often ...

Geodes, for instance, are created when mineral-rich water seeps into hollow spaces within rock formations and slowly evaporates, leaving behind dazzling crystals like quartz and amethyst.

Pennsylvania may not be the first place that comes to mind when thinking of gemstone mining, but the Keystone State has a surprising diversity of beautiful natural gemstones that can be found across ...