psilomelane

Fetched 2026-10-26 (cache).

Datamuse reports no synonyms or antonyms for this word.

Noun

1. Any hard, black [[hydrous]] [[manganese]] [[oxide]] with variable amounts of [[barium]] and [[potassium]].

Source: Wiktionary · CC BY-SA 4.0 (Wiktionary dump) · cached copy, not a rewrite.