Transparency: Gypsum Can range between transparent to translucent, depending upon the crystal formation and existence of inclusions. Transparent crystals allow for light to go through Obviously, even though translucent specimens let some gentle passage but show up cloudy or hazy. Salt Flats: Gypsum is a common element of salt flats, https://www.propanraya.com/id/produk/eco-gypsum-ee-4050