それが何であるか
Gold occurs as the metal itself, usually as microscopic grains locked in sulfide or quartz rather than as visible nuggets.
鉱石鉱物
Gold occurs as the metal itself, usually as microscopic grains locked in sulfide or quartz rather than as visible nuggets.
Gold occurs as the metal itself, usually as microscopic grains locked in sulfide or quartz rather than as visible nuggets.