Crystal & GemLearn about the formation and practical uses of crystals, semiprecious stones, and precious metals. The dazzling full-color photographs on uncluttered pages make this a visual treat.--School Library Journal. |
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Common terms and phrases
abrasive Africa agate almandine amber Amethyst ancient aquamarine atoms Australia beauty BENITOITE beryl blue Brazil cabochons calcite called carats carving cat's-eye cavities century chalcedony Chrysoberyl citrine cleavage colorless containing copper cordierite corundum CRYSTAL Crystal system crystal groups Crystal system crystalline cubic demantoid deposits diamond emerald Essential symmetry facets famous feldspar fluorite garnet gem-quality gemstones gold grains granite graphite gravel green grossular grow growth hardness heliodor hexagonal iron jadeite jewelry known lapis lazuli lava layers light material metals mica minerals mines Mohs moonstone Myanmar natural nephrite occur opal pearls pegmatites peridot piezoelectric pink plane Platinum play of colors polished popular precious opal prism produced pyrope quartz crystal rare rock crystal ruby rutile sapphire shape shows silicate silver specific gravity specimen Spessartine spinel Sri Lanka stones structure surface synthetic tiger's-eye tiny topaz tourmaline turquoise twin USSR variety veins yellow zircon