Pseudomorph
Pronunciation : Pseu"do*morph
Part of Speech : n.
Etymology : [See Pseudomorphous.]
Definition : 1. An irregular or deceptive form.
2. (Crystallog.)
Defn: A pseudomorphous crystal, as a crystal consisting of quartz, but having the cubic form of fluor spar, the fluor crystal having been changed to quartz by a process of substitution.
Source : Webster's Unabridged Dictionary, 1913