Ferrimolybdite or a closely related mineral occurred on the north side of Battle Mountain as bright yellow, capillary crystals in cracks and joints of weathered plagioclase phonolite, and with ilsemannite as an alteration product of molybdenite in a vein exposed in the Ophelia tunnel (Lindgren and Ransome, 1906; Eckel, 1997).
Ilsemannite (?) [Mo.sub.3][O.sub.8] * n[H.sub.2]O (SO)
MOLYBDENUM bloudmoney (OED blood-money 1535q), embullyoned (OED em- 1523q), molybdenum-blue (OED ilsemannite
Mineralogical reaction products where mine wall-rock has been exposed to humidity and air include gypsum, halotrichite, ilsemannite
, jarosite, and szmolnokite.