Manganese oxide
The University of Arizona Mineral Museum in the Flandreau Science Center and Planetarium
The University of Arizona
Tucson, AZ, USA
2018-02-20 10:31:46 AM
Canon EOS 6D, f/4.5 @ 92 mm, 1/80, ISO 1000, No Flash
Joseph A. Carr www.JoeCarr.ca
