from Wiktionary, Creative Commons Attribution/Share-Alike License
- n. A rare manganese iron oxide mineral with a black metallic appearance.
from The Century Dictionary and Cyclopedia
- n. A rare manganate of iron (essentially FeMnO3), occurring in black cubic crystals with brilliant metallic luster. It is related to perovskite, and occurs in rhyolite in southern Utah.
Maynard Bixby, American mineralogist, + -ite. (Wiktionary)