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Ferroanthophyllite in Rockport grunerite: A transmission electron microscopy study

¹ Central Facility for Advanced Microscopy and Microanalysis, University of California, Riverside, California 92521, U.S.A.
² Department of Geological Sciences Box 351310, University of Washington, Seattle, Washington 98195-1310, U.S.A.

Correspondence: ^* E-mail: bozhilov{at}citrus.ucr.edu

A transmission electron microscopy study reveals the microstructure of polysynthetically twinned, near end-member grunerite from Rockport, Massachusetts. A small percentage of Pnma ferroanthophyllite of similar composition is present as thin slabs intergrown parallel to (100) of grunerite and as individual µ-size crystals. HRTEM imaging shows that grunerite is free of chain-multiplicity faults. The observed microstructures are interpreted as a result of partial transformation of ferroanthophyllite to grunerite, a mechanism that is also supported by microstructures observed in the Pnmn protoferroanthophyllite from Cheyenne, Colorado, with similar composition. This study supports the possibility that grunerite, ferroanthophyllite, and protoferroanthophyllite may all possess true stability fields.

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