MINERAL OF THE MONTH By Ronald L. Parker, Senior Geologist, Task Fronterra Geoscience, 700 17th Street, Suite 1700, Denver, CO 80202 | ron.parker@taskfronterra.com
ORPIMENT Pretty poison
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Butterscotch-colored orpiment from Humboldt, County, Nevada. Photo by Mel Klinger.
OUTCROP | February 2016
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Vol. 65, No. 2 | www.rmag.org