碳酸岩 Traditional form: 碳酸岩 Pinyin (reading): tànsuānyán Definitions: carbonate rock (geology) Characters: 碳 - carbon 酸 - tart, sour; spoiled; acid 岩 - cliff; rocks; mountain Traditional characters: 碳 - carbon 酸 - tart, sour; spoiled; acid 岩 - cliff; rocks; mountain