Inclusions: Pure gypsum crystals frequently include inclusions, which can be foreign minerals or components trapped in the crystal structure through formation. Frequent inclusions in gypsum may be clay minerals, iron oxides that bring about coloration, or maybe little gasoline bubbles. Crystal Technique: Gypsum crystals belong into the monoclinic crystal procedure. https://www.propanraya.com/id/produk/eco-gypsum-ee-4050