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Introduction: the crystal; crystal formation; crystal solutions; growth rate; distinguishing features; crystal habit; striations; classifications; chemical impurities; colour; hardness; lustre; cleavage; specific gravity; crystal uses; synthetic crytals. Crystal identifier: diamond; ruby; sapphire; chrysoberyl; spinel; topaz; aquamarine; beryl; bixbite; emerald; golden beryl; morganite; phenacite; andalusite; danburite; indicolite; iolote; pyrope; rubellite; stauroite; tourmaline; verdelite; amethyst; citrine; milky quartz; rock crystal; rose quartz; smokey quartz; tiger-eye; quartz cat's-eye; almandine; grossular; rhodolite; spessarite; zircon; agate; axinite; chalcedony; jade; jasper; peridot; tanzanite; vesuvianite; cassiterite; epidote; hiddenite; kunzite; amazonite; benitoite; labradorite; moonmstone; prehnite; pyrite; orthoclase; hematite; magnetite; opal; rhodnite; sodalite; lapis lazuli; brezilianite; chromite; enstatite; nickeline; diopside; lazulite; turquoise; uraninite; apatite; dioptase; hemimorphite; scheelite; platinum; kyanite; smithsomite; variscite; fluoirte; pyrrhotite; chalcopyrite; dolomite; malachite; spalerite; celestite; cerussite; calcite; barite; chalcocite; copper; galena; silver; brucite; gold; halite; muscovite; vermiculite; argentite; bismuth; borax; cinnabar; gypsum; stibnite; sulfur; bauxite; graphite, molybdenite; montmorillonite; talc; mercury.