Calcareous sinter is a white or pale deposit that is formed from mineral springs, streams, and other natural sources. There are several synonyms for calcareous sinter, including travertine, tufa, limestone, and calcite. These terms signify different variations of the same type of sedimentary rock that is rich in calcium carbonate. Travertine is a type of calcareous sinter that is formed in caves or around hot springs, while tufa is a porous and lightweight version of the mineral. Limestone is a dense and durable rock that is often used for construction purposes, while calcite is a crystalline form of calcium carbonate that is found in mineral deposits. Regardless of the synonym used, calcareous sinter serves as a valuable resource for geologists and naturalists alike.