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May-June 2012

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Contributed Papers in Specimen Mineralogy: 38th Rochster Mineralogical Symposium Abstracts: Part 2

THE TWENTY-EIGHTH TECHNICAL SESSION of the Rochester Mineralogical Symposium was held on 15 and 16 April 2011. Submitted abstracts were reviewed by a committee consisting of Dr. Carl Francis, Harvard University; Dr. Marian Lupulescu, New York State Museum; Dr. George Robinson, Michigan Technological University; Dr. Sarah Hanson, Adrian College; and Dr. Steven C. Chamberlain, New York State Museum. Twenty-one abstracts were submitted, accepted, and scheduled for platform presentations. The accepted abstracts follow.

PHLOGOPITE TRIPLETS FROM THE SELLECK ROAD OCCURRENCE, WEST PIERREPONT, ST. LAWRENCE COUNTY, NEW YORK. S. C. Chamberlain1, M. Walter2, and R. P. Richards3. 1Center for Mineralogy, 3140 CEC, New York State Museum, Albany, NY 12230; 2PO Box 137, 2982 State Rt. 11B, Nicholville, NY 12965; 3154 Morgan St., Oberlin, OH 44074.

During 2010, excavations at the well-known Selleck Road occurrence east of West Pierrepont, New York, revealed a suite of minerals unusual for the locality. Although best known for green tremolite and dark brown uvite crystals, numerous other minerals occur along the contacts between calc-silicate metasediments and Grenville-aged marble. The new collecting occurred several hundred yards east of the parking area at the western base of the first east-west ridge. The various mineralized contacts contained crystals of albite, heulandite-Ca, marialite, microcline as a replacement of marialite, phlogopite, and uvite in addition to the calcite of the marble and the metamorphic reaction calcite along the contacts. The heulandite-Ca, not previously identified from this locality, probably represents a weathering product of the marialite.

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