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plural pseudomorphs
A deceptive, irregular, or false form; specifically:
(geology, mineralogy) A mineral that formed by replacement of an existing mineral (or organic matter) such that the new mineral has the appearance and dimensions of the original. quotations
The first kind of pseudomorphs, are pseudomorphs by alteration; the second, pseudomorphs by replacement; the third, pseudomorphs by infiltration; the fourth, pseudomorphs by incrustation.
1852, James D. Dana, A Manual of Mineralogy, page 54
third-person singular simple present pseudomorphs, present participle pseudomorphing, simple past and past participle pseudomorphed
To be transformed into such a form examples