Amethyst . A member of the quartz family, amethysts with intense, rich purple shades have long been considered the most precious of these n ...

Amethyst geodes in Uruguay have been found in cooled lava flows, which date from the original breakup of the supercontinent Gondwana around 134 million years ago. However, their formation has ...

Why is the dead of winter a good time to start a new year, anyway? In the medieval era, much of Europe thought March 25th was ...