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Answer for the clue "A source of manganese ", 11 letters:
psilomelane

Alternative clues for the word psilomelane

Word definitions for psilomelane in dictionaries

Wiktionary Word definitions in Wiktionary
n. Any hard, black hydrous manganese oxide with variable amounts of barium and potassium.

Wikipedia Word definitions in Wikipedia
Psilomelane is a group name for hard black manganese oxides including hollandite and romanechite . Psilomelane consists of hydrous manganese oxide with variable amounts of barium and potassium . Psilomelane is erroneously, and uncommonly, known as black ...

The Collaborative International Dictionary Word definitions in The Collaborative International Dictionary
Psilomelane \Psi*lom"e*lane\, n. [Gr. ? bare + ?, ?, black.] (Min.) A hydrous oxide of manganese, occurring in smooth, botryoidal forms, and massive, and having an iron-black or steel-gray color.

WordNet Word definitions in WordNet
n. a mineral consisting of hydrated basic oxide of manganese and barium; a source of manganese