Ключевые слова: april, beautiful, birthstone, blue, clear, colorless, crystal, crystalline, crystallization, crystallography, crystals, faden quartz, fadenquarz, gem, gemstone, geology, geomorphology, jewel, macro, mineral, mineralized, natural, pebbles, precious, quartz, quarz, raw, rock, rock crystal, sacred, science, shining, shiny, silica, silicate, silicon, silicon dioxide, sio2, stone, tabular, thread, transparent, unpolished, volcanic, white,