Formula: (Ta,Nb,Sn,Fe,Mn)4O8 Orthorhombic
Description: Ixiolite is a rare dark gray to steel gray mineral found in granite pegmatites.
MARATHON COUNTY: Ixiolite is found as elongated crystals up to 2 mm long in pegmatites at the Koss Pit (SW sec. 2 T.27 N. R.5E.) SW of Rib Mountain (Buchholz, Falster and Simmons, 1999, 2000). It is also tentatively noted from the Maguire Pit in the Ladick Quarry complex (sec. 19 and 20 T. 27N. R.6E.) (Buchholz and Simons, 2002; Buchholz et al., 2004).