In the examination of altered schists from the quarry at Safe Harbor, Pa., the author found small idiomorphic crystals of cordierite in association with other aureolitic minerals. These cordierite crystals are quite abundant forming in some instances as much as 25% of the rock. As far as the author is aware, idiomorphic cordierite has not been reported from Pennsylvania, and it is the purpose of this note to place this locality on record.

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