Gypsum Caves: Gypsum Caves, also referred to as gypsum karst caves, form with the dissolution of gypsum by groundwater. As slightly acidic water percolates as a result of gypsum-rich bedrock, it step by step dissolves the gypsum, making underground voids and passages. Gypsum deposits most commonly form in evaporative environments https://www.propanraya.com/id/produk/eco-gypsum-ee-4050