DIRK WIERSMA / SCIENCE PHOTO LIBRARY DIRK WIERSMA / SCIENCE PHOTO LIBRARY
The acicular (needly) blue crystals are of Buttchenbachite, a rare copper chloro-nitrate mineral. Sample is from the Panda mine at Likasi, Katanga. The cubic crystals of the substrate are of cuprite. Actual width of sample is 60 mm.
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