Tags: Chemical Substance, Mineral.
Alstonite also known as bromlite is a low temperature hydrothermal mineral that is a rare double carbonate of calcium and barium with the formula BaCa(CO3)2 sometimes with some strontium. Barytocalcite and paralstonite have the same formula but different structures so these three minerals are said to be trimorphous. Alstonite is triclinic but barytocalcite is monoclinic and paralstonite is trigonal. The species was named bromlite by T.
