Ключевые слова: agate, background, banded, beautiful, black, chalcedony, concentric, decorative, design, detail, dioxide, gem, gemstone, geode, geology, inside, isolated, layer, macro, mineral, mineralogy, natural, no people, ornament, pattern, polished, quartz, red, sample, semiprecious, silica, silicon, slice, sliced, smooth, specimen, stone, streaks, stripe, striped, structure, surface, texture, textured, translucent, volcanic, white,