psilomelane

Noun

Meaning

A hydrous oxide of manganese, occurring in smooth, botryoidal forms, and massive, and having an iron-black or steel-gray color.

Source: Webster's dictionary

chromite ilmenite limonite galena chalcopyrite covellite goethite hematite cassiterite grossular bornite crocoite braunite andradite hausmannite

Show all synonyms

mineral