Ключевые слова: artifact, background, black, brown, close up, collection, colorful, crystal, czech, dendritic opal, detail, gem, gemstone, geology, hyalite, industry, isolated, macro, macrophotography, mine, mineral, mineralogy, mining, mullers, museum, natural, nature, opal, precious, raw, republic, resource, rock, rough, sample, silica, small, specimen, stone, translucent, transparent, unprocessed, water, white, yellow,