Deposition: Gypsum To begin with kinds as dissolved calcium and sulfate ions in h2o. These ions can originate from various resources, including the dissolution of calcium-that contains minerals in rocks as well as leaching of sulfur compounds from organic and natural make any difference and volcanic emissions. Hydration of Anhydrite: https://www.propanraya.com/id/produk/eco-gypsum-ee-4050