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.