MINERAL OF THE MONTH By Ronald L. Parker, Senior Geologist, Borehole Image Specialists, P. O. Box 221724, Denver CO 80222 ron@bhigeo.com
PYROLUSITE Stealth Manganese
Cluster of many intersecting lustrous black pyrolusite pseudomorphs after manganite. Crystals up to 14 mm long. Pinal County, Arizona. Used with permission from John Betts Fine Minerals OUTCROP | December 2017
34
Vol. 66, No. 12 | www.rmag.org