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Cronstedtite from
Old Mine Park (Old Tungsten Mine), Long Hill, Trumbull, Fairfield County, Connecticut, USA

Locality type:Park
Classification
Species:Cronstedtite
Formula:Fe22+Fe3+((Si,Fe3+)2O5)(OH)4
Comments:This is all the information provided by Hoadley on the purported cronstedtite: "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.2Fe2O3.3SiO2.4H2O. The specimen shows a group of black crystals 1/8 inch in diameter with perfect basal cleavage, hardness = 3.5, and rhombohedral
hemimorphic, with the forms c (0001) and x (bar2021). This is believed to be the first occurrence of the mineral in the United States..." Identity questioned by Manchester (1931), p. 38. Description sounds like the common clinochlore found here.
Habit:rhombohedral hemimorphic, with the forms c (0001) and x (bar2021)
Colour:black
Abundance at site:Extremely Rare
Confirmation
Validity:Unconfirmed/Questioned
References
References:Hoadley, Charles W. (1918): An American Occurrence of Cronstedtite. American Mineralogist: 3:6.; Manchester, James G. (1931): The Minerals of New York City and Its Environs. Afferton Press. 168 p.
Data
Mineral Data:Click here to view Cronstedtite data
Locality Data:Click here to view Old Mine Park (Old Tungsten Mine), Long Hill, Trumbull, Fairfield County, Connecticut, USA
Nearest other occurrences of Cronstedtite
61.5km (38.2 miles) State Route 9 rock cuts, Haddam, Middlesex Co., Connecticut, USA
 
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