Ключевые слова: abstract, agate, amethyst, beauty, blue, calcium, celestine, celestite, chalcedony, cold, collection, color, cool, crystal, crystalline, detail, druse, education, esoteric, frost, gem, gemstone, geode, geology, ice, isolated, jewel, light, macro, madagascar, medicine, mineral, mineralogy, mining, natural, pattern, precious, quartz, rare, rock, sapphire, semiprecious, shiny, sky, specimen, stone, structure, surface, texture, translucent,