| Knebelite | |
| Formula: | (Fe,Mn)SiO |
| System: | Orthorhombic |
| Color: | dark green |
Knebelite is a manganese variety of the fayalite-tephroite series with formula . 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.[1]