
Large museum quality specimen of a rare manganese mineral very rarely seen in large showy specimens as this one.
Dimensions: 14.7 x 10.9 x 9.2 cm
Species: Groutite
Locality: Roberts Mine, Cuyuna Range, Crow Wing Co., Minnesota, USA
Dimensions: 14.7 x 10.9 x 9.2 cm
Species: Groutite
Locality: Roberts Mine, Cuyuna Range, Crow Wing Co., Minnesota, USA