硬こう石せっ膏こう

こ

う

せ

っ

こ

う

Meanings

1

noun

anhydrite

mineralogy

A mineral composed of anhydrous calcium sulfate (CaSO₄). Used in geology and mineralogy.

stiff, hard

石stone

膏fat, grease, lard

石せっ膏こう
石膏 (gypsum) is the hydrated calcium sulfate mineral, while 硬石膏 (anhydrite) is the anhydrous form.

From 硬 (hard) + 石膏 (gypsum), referring to its hardness relative to gypsum and its anhydrous composition.