coronadite

from The Century Dictionary.

• noun A mineral of somewhat uncertain composition, but consisting essentially of lead manganite (PbMn₃O₇). It occurs in black massive forms with fibrous structure in the Clifton-Morenci copper district in Arizona.

from Wiktionary, Creative Commons Attribution/Share-Alike License.

• noun mineralogy A monoclinic-prismatic mineral containing aluminum, barium, lead, manganese, oxygen, and vanadium.