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Definition of pseudomorph

A mineral sample with the external crystal form of one mineral and the internal chemistry of another; e.g., cubes of geothite after pyrite resulting from oxidation of the ferrous sulfide to ferric oxyhydroxide.

Compare with: paramorph

Frondel, C. (1935). Catalogue of mineral pseudomorphs in the American Museum of Natural History. Bulletin of the AMNH; v. 67, article 9.
http://digitallibrary.amnh.org/bitstream/handle/2246/860/B067a09.pdf;jsessionid=ABA713C63D9777DF7EB0B16807F7FDE8?sequence=1
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