Chloritoid is a mineral that is not yet well known. Its crystal-lographic symmetry and its chemical composition are disputed.1 More than 50 years ago Tschermak2 contended that the symmetry was monoclinic and he also assigned a chemical formula to it. To be sure, his contentions are still accepted by the majority of mineralogists, but a good many writers have also reported results in apparent disagreement with Tschermak's observations. New, and rather decisive data on chloritoid from a new locality in Dutchess County should therefore be of some value.

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