Wiktionary
glaucochroite
n. (context mineral English) A calcium manganese nesosilicate mineral occurring in metamorphosed limestones.
Wikipedia
Glaucochroite
Glaucochroite is a calcium manganese nesosilicate mineral with formula: CaMnSiO. It occurs in metamorphosed limestones.
It was first described in 1899 in Franklin Furnace, Sussex County, New Jersey.