Geographic Minerals



Glaucochroite is a calcium manganese nesosilicate mineral with formula: CaMnSiO4. It occurs in metamorphosed limestones. It is a mineral that consists of a calcium manganese silicate, occurs in bluish green prismatic crystals, and is related to monticellite

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

General information

  • Formula: CaMn2+SiO4
  • Luster: Vitreous, Resinous
  • Crystal System: Orthorhombic
  • Member of: Olivine Group

Fig: Glaucochroite Рcalcium manganese nesosilicate mineral


  • Color: Green, White, Pinkish.
  • Density: 3.4
  • Diaphaneity: Translucent
  • Fracture: Brittle – Generally displayed by glasses and most non-metallic minerals..
  • Hardness: 6 – Orthoclase
  • Luminescence: Non-fluorescent.
  • Luster: Vitreous (Glassy)
  • Magnetism: Nonmagnetic
  • Streak: white

Occurrence: In a metamorphosed stratiform zinc deposit (Franklin, New Jersey, USA); in skarn at the contact between diabase and marble (Anakin Creek, Russia); in calc-silicate rocks with manganese ores (Kuruman, South Africa).

Association: Nasonite, willemite, andradite, hardystonite, tephroite, clinohedrite, esperite, leucophoenicite, hodgkinsonite, diopside, cuspidine, calcite, franklinite, zincite (Franklin, New Jersey, USA).


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