Abstract

On a recent trip of the New York Mineralogical Club, under the guidance of the writer, to the Hubbard tungsten mine at Long Hill (Trumbull Township), Connecticut, Mr. George E. Ashby found a specimen of a chlorite, determined by Mr. Lazard Cahn as cronstedtite, 4FeO.2Fe2O3.3SiO2.4H20. The specimen shows a group of black crystals ⅛ inch in diameter with perfect basal cleavage, hardness = 3.5, and rhombohedral hemimorphic, with the forms c (0001) and x (2021). This is believed to be the first occurrence of the mineral in the United States, the only known localities cited by Dana being Bohemia, England, and Brazil.

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