Density and Unique Gravity: Density refers to the mass for each device quantity of the compound, although unique gravity compares a mineral's density to the density of h2o. Gypsum employs include: manufacture of wallboard, cement, plaster of Paris, soil conditioning, a hardening retarder in portland cement. Kinds of gypsum known https://www.propanraya.com/id/produk/eco-gypsum-ee-4050