cryptomelane
Noun
Meaning
cryptomelane
(mineralogy) A monoclinic-prismatic mineral containing manganese, oxygen, and potassium.
Synonyms
pyrolusite
pyrope
manganite
samarskite
psilomelane
grossular
rhodochrosite
euxenite
andradite
hausmannite
braunite
microlite
tephroite