Ключевые слова: background, biotite, black, board, brown, closeup, collection, color, crystal, dark, decoration, dielectric, fragility, gemstone, geological, geology, glass, horizontal, insulatingmaterial, insulator, isinglass, layered, level, macro, material, mica, mineral, mining, multilayered, natural, nature, pebble, phlogopite, plate, reddishbrown, rock, sample, scaly, semitransparent, sheet, shiny, slice, small, stone, surface, texture, textured, white,