Solubility: Gypsum Is reasonably soluble in water, with a solubility of about 2 grams for every liter at 25°C. Interestingly, gypsum exhibits retrograde solubility, this means its solubility decreases as h2o temperature boosts – in contrast to most salts that develop into far more soluble in very hot water. Agates: https://www.propanraya.com/id/produk/eco-gypsum-ee-4050