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

Giant blobs that lurk near Earth's core are ... Every time a wave crosses a boundary between two crystals, known as a grain boundary, it loses energy. If the crystals are smaller, there are ...

LONDON, Jan 18 (Reuters) - Jean-Philippe Mateta scored twice in the second half as Crystal Palace completed a 2-0 Premier League away win at a toothless West Ham United on Saturday, more evidence ...