Category: crystals...

drinking from crystal glass
hanging cut-lead crystals in the windows to bring energy into the house
a crystal paperweight on your desk for good luck and prosperity
feng shui items such as mirrors and crystals to promote the harmonious flow of chi
any solid object in which an orderly three-dimensional arrangement of the atoms, ions, or molecules is repeated throughout its volume - like quartz and gemstones
rock crystal, valued for its clarity and total lack of color or flaws - with vessels and spheres carved from large crystals since ancient times
rhinestones - originally quartz pebbles found in the Rhine River
crystal gazing, also called scrying, the divination of distant or future events based on visions seen in a ball of rock crystal
liquid crystal, that flows as a liquid but maintains some of the ordered structure characteristic of a crystal