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July-August 2011

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Road-Cut Mineral Occurrences of St. Lawrence County, New York: Part 4—The Yellow Lake South Road Cut

Recently, we published an article on the Yellow Lake Road Cut (Chamberlain and Walter 2006). In summer 2006, one of us (MW) encountered another series of mineralized pockets on the same ridge, a short distance south of the well-known locality. Over a period of two weeks, hundreds of noteworthy specimens were recovered. We report this new set of pockets as the road cut at Yellow Lake South (YLS) because it has a suite of minerals and crystal habits that are distinct from those at the original locality, which we shall refer to as Yellow Lake North (YLN). Moreover, we are able to report and illustrate the actual extraction of significant pockets of specimens—something we were unable to do for YLN. Comparing and contrasting these two occurrences provide an interesting insight into fracture-filling occurrences in the Grenville Marble.

Dr. Steven C. Chamberlain, a passionate collector specializing in the minerals of New York State, is coordinator of the Center for Mineralogy at the New York State Museum.

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