Gypsum Are available in hydrothermal veins, that are fractures in rocks full of mineral-abundant fluids that originate from deep inside the Earth's crust. Soil drinking water possible checking: a gypsum block might be inserted in to the soil, and its electrical resistance could be calculated to derive soil humidity.[forty six] https://www.propanraya.com/id/produk/eco-gypsum-ee-4050