Cleavage: Cleavage Refers to some mineral's tendency to interrupt together precise planes of weak spot. Gypsum reveals excellent cleavage in one route and good cleavage in A different course. This allows it to interrupt into predictable flat or a little bit angled pieces. Gypsum is considered non-poisonous, but extended publicity https://www.propanraya.com/id/produk/eco-gypsum-ee-4050