Glaucochroite

Glaucochroite is a calcium manganese nesosilicate mineral with formula CaMnSiO₄. It occurs in metamorphosed limestones.

Glaucochroite
Glaucochroite found in New Jersey
General
Category	Silicate mineral
Formula	CaMnSiO4
Strunz classification	9.AC.05
Dana classification	51.3.2.3
Crystal system	Orthorhombic
Identification
Color	Bluish-gray, pink, brown, or white
Fracture	Conchoidal, sub-conchoidal
Mohs scale hardness	6
Luster	Vitreous, sub-vitreous, resinous
Streak	white
Optical properties	Biaxial (−)
References	[1]

It was first described in 1899 in Franklin Furnace, Sussex County, New Jersey.