Barytocalcite is an anhydrous barium calcium carbonate mineral with the chemical formula BaCa(CO<sub>3</sub>)<sub>2</sub>. It is trimorphous with alstonite and paralstonite, that is to say the three minerals have the same formula but different structures. in veins in limestone, associated with fluorite, calcite and baryte.
- England: Nentsberry Haggs Mine, Alston Moor, Cumbria. A 21 cm specimen with lustrous honey-coloured crystals of barytocalcite to 2 cm on crystalline witherite was collected here in 1972, and well formed crystals of barytocalcite were found in the 1990s
- US: South Ouray, Uintah County, Utah. Barytocalcite occurs in the dolomitic oil shale of the Eocene Green River Formation of South Ouray