manganite
Noun
Meaning
One of the oxides of manganese; -- called also gray manganese ore. It occurs in brilliant steel-gray or iron-black crystals, also massive.
A compound of manganese dioxide with a metallic oxide; so called as though derived from the hypothetical manganous acid.
Source: Webster's dictionarySynonyms
rhodonite
pyrolusite
pyrope
psilomelane
grossular
rhodochrosite
andradite
hausmannite
braunite
tephroite
spessartine
tsavorite
alabandite
hollandite
jacobsite
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