Glaucochroite is a calcium manganese nesosilicate mineral with formula . It occurs in metamorphosed limestones. It was first described in 1899 in Franklin Furnace, Sussex County, New Jersey. References Webmineral.com Handbook of Mineralogy Calcium minerals Manganese(II) minerals Nesosilicates Orthorhombic minerals Minerals in space group 62 Minerals described in 1899