Knebelite

Knebelite is a silicate mineral, a manganese variety of fayalite with formula (Fe,Mn)₂SiO₄. 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.

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Simple	Hausmannite Manganite Manganosite Nsutite Pyrolusite

Mixed	Birnessite Bixbyite Ferrocolumbite Ferrotantalite Galaxite Jacobsite Manganotantalite Psilomelane Romanèchite Tantalite Todorokite Umber

Other