MINERAL OF THE MONTH By Ronald L. Parker, Senior Geologist, Borehole Image Specialists, P. O. Box 221724, Denver CO 80222 ron@bhigeo.com
TALC Usefully Soft
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Flat slab of platy talc with a pervasive crenulation cleavage texture. The talc is altered from thin slivers of sheared Iapetan oceanic crust wedged between the Taconic and Acadian orogenic pulses during building of the Appalachians. The slab measures 24 cm x 18 cm and was collected from a quarry in Ludlow, Vermont. Photo by Ronald L. Parker. OUTCROP | February 2018
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Vol. 67, No. 2 | www.rmag.org