Soil Water opportunity checking: a gypsum block could be inserted in the soil, and its electrical resistance is usually measured to derive soil humidity.[48] Crystal System: Gypsum crystals belong on the monoclinic crystal procedure. This crystal construction has three unequal axes, with 1 angle involving axes remaining non-90 levels. Stucco: https://www.propanraya.com/id/produk/eco-gypsum-ee-4050