The easiest method to learn about minerals is to study with a collection of smaller specimens that you can deal with, study, and observe their Attributes. Affordable mineral collections are available in the Geology.com Store. Impression copyright iStockphoto / Anna Usova. Hydration of Anhydrite: Gypsum might also kind from the https://www.propanraya.com/id/produk/eco-gypsum-ee-4050