title: Knebelite
text: # Knebelite
  
  Knebelite is a manganese variety of the fayalite-tephroite series with formula $(Fe,Mn)_2SiO_4.$ It forms dark green orthorhombic crystals. It is reported from a variety of locations in Sweden as well as South Africa, Russia, British Columbia, New Hampshire, and Rhode Island.
  
  