The Obvious way to study minerals is to study with a collection of modest specimens you can cope with, analyze, and observe their Attributes. Reasonably priced mineral collections are available in the Geology.com Retail store. Image copyright iStockphoto / Anna Usova. Gypsum continues to be widely accustomed to salvage alkali https://www.propanraya.com/id/produk/eco-gypsum-ee-4050