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The Collaborative International Dictionary
Knebelite

Knebelite \Kne"bel*ite\, n. [From Major von Knebel.] (Min.) A mineral of a gray, red, brown, or green color, and glistening luster. It is a silicate of iron and manganese.

Wiktionary
knebelite

n. (context mineralogy English) A silicate mineral, a manganese variety of fayalite that forms dark green orthorhombic crystals.

Wikipedia
Knebelite

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