Inclusions: All-natural Gypsum crystals normally comprise inclusions, which happen to be international minerals or resources trapped throughout the crystal framework during formation. Widespread inclusions in gypsum might be clay minerals, iron oxides that induce coloration, or simply tiny gas bubbles. Crystal Process: Gypsum crystals belong into the monoclinic crystal technique. https://www.propanraya.com/id/produk/eco-gypsum-ee-4050