👉 Ephthalite is a mineral that is commonly found in rocks and soil. It is composed of calcium carbonate, which is a hard, durable material used as a binder for cement and other construction materials. Ephthalite can be distinguished from other types of calcareous minerals by its coloration, which changes depending on the specific type of mineral. In general, it is a pale yellow or white color with a smooth, lustrous surface.
