English: Calcite containing Niobium (giving it distinctive bluish color), from Medford Quarry, Caroll County, Maryland. Collected 2002. Scale bar is 1 cm.
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2010-02-06 19:12 Jstuby 458×486 (53085 bytes) [[Calcite]] containing [[Niobium]] (giving it distinctive bluish color), from Medford Quarry, Caroll County, Maryland. Collected 2002. Scale bar is 1 cm.
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