Ключевые слова: agate, aquamarine, blue, blue vug, cerulian, chalcedony, crystal, crystalline, druzy chalcedony, facet, fluoresence, gem, gem stones, gemstone, geology, gossan, hemimorphite, industrial, infrared, iron cap, jewel, lead, mine, mineral, mining, natural, nature, ore, quartz, rock, sample, science, semiprecious, smithsonite, sorosilicate, specimen, sphalerite, stone, ultraviolet, vug, zinc, zinc carbonate, zine sulfate,