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Knebelite is a manganese variety of the fayalite-tephroite series 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.

References

1. Knebelite on Mindat

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v t e Manganese minerals
Borates	Sussexite Tusionite
Carbonates	Ankerite Kutnohorite Rhodochrosite Manganoan calcite
Oxides	Simple Hausmannite Manganite Manganosite Nsutite Pyrolusite Mixed Birnessite Bixbyite Ferrocolumbite Ferrotantalite Galaxite Jacobsite Manganotantalite Psilomelane (calvonigrite) Romanèchite Tantalite Todorokite Umber
Phosphates	Childrenite Graftonite Lithiophilite Natrophilite Purpurite Triplite Triploidite Zanazziite
Silicates	Babingtonite Braunite Brownleeite Calderite Chloritoid Eudialyte Glaucochroite Jeffersonite Knebelite Ottrelite Piemontite Pyroxferroite Rhodonite Spessartine Sugilite Tephroite Zakharovite Zircophyllite
Sulfides	Alabandite Hauerite Rambergite
Other	Axinite (borosilicate) Geigerite (arsenate) Manganese nodule (various) Samsonite (sulfosalt) Zincobotryogen (sulfate) Wolframite (tungstate) Hübnerite (tungstate)
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