MINERAL OF THE QUARTER By Ronald L. Parker Senior Geologist, Borehole Image Specialists, P. O. Box 221724, Denver CO 80222 ron@bhigeo.com
SPHALERITE Bold and Brassy
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Lustrous black sphalerite crystals atop bladed brown siderite crystals on a quartzcoated matrix. Smallcleugh Mine, Nenthead, Alston Moor, Cumbria, England. 10 cm in long dimension. Used with permission from John Betts Fine Minerals, Inc. OUTCROP | May 2023
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Vol. 72, No. 5 | www.rmag.org