Density And Precise Gravity: Density refers back to the mass for each unit volume of the material, even though unique gravity compares a mineral's density into the density of h2o. Gypsum occurs in extensive beds related to other evaporite minerals (e.g., anhydrite and halite), specially in Permian and Triassic sedimentary https://www.propanraya.com/id/produk/eco-gypsum-ee-4050