硫酸钙 Traditional form: 硫酸鈣 Pinyin (reading): liúsuāngài Definitions: calcium sulfate Characters: 硫 - sulfur 酸 - tart, sour; spoiled; acid 钙 - calcium Traditional characters: 硫 - sulfur 酸 - tart, sour; spoiled; acid 鈣 - calcium