Steve Arnold wrote: "I have seen with many eucrites that there is a polymict type and a monomict type. What are the differences?
Geoff responded: "Dear Steve: May I recommend a very useful resource to you: The Cambridge Encyclopedia of Meteorites" Hello All, On page 344 of the glossary, we find: monomict breccia: A brecciated meteorite composed of angular fragments and matrix all of like composition On page 345 of the glossary, we find: polymict breccia: A rock made up of angular fragments or clasts from other rocks of different compositions On page 343 of the glossary, we find: genomict breccia: A brecciated meteorite in which the individual clasts are compositionally of the same group but have differing petrographic characteristics Wasson puts it this way: WASSON J.T. (1974) Meteorites Classification and Properties (Springer-Verlag, Berlin, Heidelberg, New York, Appendix I, Glossary, p. 242): Breccia: A fragmental rock type including components (the larger pieces called xenoliths or clasts) which were previously part of another rock. In a *monomict* breccia all components originated in the same rock; in a *genomict* breccia the components originated in distinct but genetically closely related rocks; in *polymict* breccias the components originated in two or more unrelated rocks. Cheers, Bernd ______________________________________________ Meteorite-list mailing list Meteorite-list@meteoritecentral.com http://six.pairlist.net/mailman/listinfo/meteorite-list