Tanteuxinite (Y,Ce,Ca)(Ta,Ti,Nb)2(O,OH)6 Orthorhombic

Description: Tanteuxinite forms brownish black resinous crystals and masses in granite pegmatites and placer deposits derived from them.

MARATHON COUNTY: Tanteuxinite was identified from pegmatites in theKoss pit, a rotten granite" quarry several miles west of Wausau (Tom Buchholz, pers. com.)
Tiny grains of a mineral tenbtatively identified as a "tanteuxinite-like" mineral was reported from pegmatites at the wimmer #3 pit, soiuth of rib mountain, near Wausau. (Tom Buchholz, pers. com.).

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