Cleavage: Cleavage refers to the mineral's tendency to break together distinct planes of weak spot. Gypsum displays ideal cleavage in one course and great cleavage in another direction. This allows it to interrupt into predictable flat or somewhat angled pieces. Above geological time scales, these crystals accumulate, forming vast deposits https://www.propanraya.com/id/produk/eco-gypsum-ee-4050