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Liebigite, Schwartzwalder Mine, Jefferson Co., Colorado


Yellowish green scales of liebigite on schist, from the Schwartzwalder Mine, Jefferson Co., Colorado.  Liebigite is a secondary uranyl carbonate mineral that shows a brilliant blue/green fluorescent response under UV, most brightly under short wave.  Being a uranium-containing mineral, liebigite is moderately radioactive.  This specimen emits approximately 1500 cpm at 1 cm.  This piece measures 39 x 38 x 21 mm, and weighs 42 grams.



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