Discovered 1825. Mined between 1829 and 1954, producing 400,000 tons of manganese ore. Located in younger, brecciated red gneiss-granite. 170m deep mine.
Several mines: Hohult, Spexeryd, Ludvigberg and Jakobsberg mines.
Ref.: (in part):
Dana 6:A3:15. D
11 entries listed. 9 valid minerals.
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Locality Updated: Woodsboro, Frederick Co., Maryland, USAFrom Bill Cordua, 13th Dec 2013 02:30:58