Ключевые слова: aesthetic, beauty, blue, collector, crystal, dark, display, feldspar, formation, geological, geology, gray, hand, iridescent, lake, light, michigan, mineral, natural, nature, object, outdoors, oval, palm, pebble, polished, reflection, rock, rockbound, shape, sheen, smooth, specimen, stone, superior, surface, tactile, texture, unique, wisp,