BASTNAESITE-CE (Ce,La)(CO3)F Hexagonal
Description: Bastnaessite-Ce is a very rare mineral found in granite pegmatites.
MARATHON COUNTY: Bastnaesite-Ce is found as red platy to coarse masses and crystals an few mm. in diameter in miarolitic cavities 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 found in similar conditions at the Wimmer Pit #3 south of Rib Mountain. The bastnaesite forms earthy patches masses that are difficut to recognize. (Buchholz and Simmons, 2002). Bastnaesite also occurs at the Red Rock Granite North Pit (along Spring Brook road) and the Ladick Quarry (sec. 19 and 20 T. 27N. R.6E.) (Buchholz and Simons, 2002).
WAUPACA COUNTY: Bastnaessite group minerals were found as eddish-brown massess in road cuts in pegmatite cutting granite along County G near Keller Lake, NE of Big Falls. Associated minerals include euxenite-(Y), biotite, fluorite, K feldspar, allanite and various sulfides. (Tom Buchholz, 2002, pers. com.)
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