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Cl Introduction Cl Purpose of study C2 Stratigraphic and lithologic setting C2 Petrography and summary of the bulk composition of tourmaline-bearing rocks C3 Sampling C7 Analytical procedure C7 Results of compositional studies Cll Tourmaline end members in nature Cll Compositional variation of tourmaline in North Gouverneur area Cll Calcium content of tourmalines C20 Substitutions in hypothetical structural formula C20 Mineralized areas and tourmaline compositions C22 Discussion C25 Comparison with the Balmat-Edwards district C29 Tourmaline genesis in the North Gouverneur area C29 Terranes showing most favorable implications for containing stratabound sulflde deposits C31 References cited C31

Significance of tourmaline-rich rocks in the Grenville Complex of St. Lawrence County, New York