Ключевые слова: agate, aggregate, background, black, closeup, color, crosssection, crystal, crystalline, cut, decorative, detail, gemology, geode, geological, geology, krakow, marble, metals, mineral, mineralogy, natural, nature, orange, organic, ornament, ornamental, oxides, quartz, red, rock, rudno, sample, semiprecious, silica, specimen, stalactite, stone, structure, surface, textured,