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September-October 2013

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Giant Crystals of Ilmenites and Baveno-Twinned Microclines from Girardville, Quebec, Canada

GIRARDVILLE IS A SMALL TOWN LOCATED IN THE LAC SAINT-JEAN AREA, 325 kilometers north of Quebec City, in the heart of the Precambrian Grenville Province of Quebec (fig. 3). North of the town, ilmenite mineralization is associated with a gneiss complex (fig. 2) but more closely with a calcite intrusion that is believed to be a calcite-carbonatite part of the Sainte-Honoré carbonatite ring complex. In the 1950s, the ilmenite mineralization was investigated for its economic potential by Lyndvue Mines, Ltd., and Baraca Mines, Ltd., but was soon abandoned because of its insufficient size (Bergmann 1958). Subsequently, the locality was largely forsaken. In recent years, the area has been visited sporadically by mineral collectors, mostly to look for large microcline and aegirine crystals. In 2001 and 2002, the second author (ED) and his partner, Mario Dubé, investigated the old exploration trenches in detail and found that the calcite-carbonatite vein contained giant well-crystallized ilmenites and large Baveno-twinned microclines.

Dr. Céline Dupuis, with a doctorate in geology, specializes in igneous petrology and geochemistry and is a professional researcher in the field of ore deposits.

Eric David, a geological engineer, has worked ten years in thin-section production at Laval University and is now working in mineral processing at COREM. He has been collecting minerals for more than twenty years, specializing in Quebec minerals from nonclassical localities

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