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.[1]

Knebelite
General
CategoryMineral
Formula
(repeating unit)
(Fe,Mn)2SiO4
Crystal systemOrthorhombic
Identification
Colordark green

References

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