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American Mineralogist; January 2004; v. 89; no. 1; p. 15-19
© 2004 Mineralogical Society of America
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2111 biopyribole intermediate between pyroxene and amphibole: Artifact or natural product?

Hiromi Konishi1,*, Reijo Alviola2 and Peter R. Buseck1,3

1 Department of Geological Sciences, Arizona State University, Tempe, Arizona 85287-1404, U.S.A.
2 Geological Survey of Finland, P.O.Box 96, FIN-02151, Espoo, Finland
3 Department of Chemistry/Biochemistry, Arizona State University, Tempe, Arizona 85287-1604, U.S.A.

Correspondence: * E-mail: hkonishi85282{at}hotmail.com

The 2111 pyribole chain sequence, where 2 signifies a double (amphibole-like) chain and 1 indicates a single (pyroxene-like) chain, has been reported from geological samples. Such material is commonly associated with slabs that contain multiples of three single chains, which we shall call "3n single-chain slabs" (where n = 1,2,3,...). We generated 2111 chain sequences and associated 3n single-chain slabs by heating natural chesterite crystals at ca. 1000 °C in the laboratory as well as by their prolonged irradiation inside a 200 kV transmission electron microscope. Many of the synthesized 2111 sequences are intergrown with narrow regions containing isolated single-and double-chain material that contains, respectively, 3n single chains and n double chains. The single-chain triplets presumably formed as a result of the decomposition of isolated triple-chain slabs that were originally intergrown with the chesterite. The 2111 sequence and the 3n single-chain slabs can form, respectively, by decomposition of chesterite and triple-chain material during observation or perhaps during ion milling. Recognizing such artifacts is important when attempting to interpret geological history from the details of biopyribole structures and intergrowths.






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