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Webster 1913 Edition

Noun.

[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.

Noun.

neb'elite. [from Von Knebel.] A mineral of a gray color, spotted with dirty white, brownish green, or green.

knebelite ‎(countable and uncountable, plural knebelites)

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