various raw gemstones and crystals with names

almandine amber amethyst andradite aragonite astrophyllite axinite background cacholong calcite carnelian chalcedony chrome chrysoprase collage collection corundum crystal description diopside dioptase eclogite epidote gem gemstone geological green iceland isolated mineral name natural opal prehnite pyrite raw rock sample set spar specimen spessartine staurolite stone tennantite tirolite topaz tourmaline turquoise various white zircon