Inclusions: All-natural Gypsum crystals generally have inclusions, that are international minerals or supplies trapped in the crystal construction throughout formation. Common inclusions in gypsum is usually clay minerals, iron oxides that bring about coloration, or simply little gasoline bubbles. Calcination: The rock is heated in kilns at precise temperatures to https://www.propanraya.com/id/produk/eco-gypsum-ee-4050