What does pseudomorph mean?
A pseudomorph is something that has the form or appearance of a different thing without the same underlying nature or composition. The term is especially important in mineralogy, where one mineral can replace another while preserving the original mineral’s external crystal shape. Such specimens are valuable because their form records a process of geological change. More generally, the word describes a false representation or imitation that resembles something genuine in appearance but lacks its true character. In this broader sense, “pseudomorph” is relatively uncommon and more literary than “imitation” or “look-alike.” Its usefulness lies in distinguishing superficial resemblance from genuine identity: the object may have the expected form, but its material nature or underlying reality is different.
A mineral or other object that has the form of a different substance or object while differing in composition or internal structure.
"Collectors value the pseudomorph because it preserves the crystal form of the mineral it replaced."
In mineralogy, the word commonly denotes a replacement mineral that retains the external shape of the original mineral.
A false form, imitation, or representation that resembles something genuine without sharing its true character.
"The political movement was dismissed as a pseudomorph of popular democracy."
This figurative use is formal and less common than the specialized geological sense.
The plural is used for individual false forms or mineral specimens, as well as for multiple examples of the phenomenon.
"The collection contains several remarkable pseudomorphs from former mining regions."
A pseudomorph is a geological disguise: the original object is gone, but its unmistakable shape survives.
Reviewed by Deb Chak, Editor. AI-assisted content curated by RJS Tech Solutions LLP.
Where does pseudomorph come from?
“Pseudomorph” combines the combining form pseudo-, from Greek pseudes meaning “false,” with Greek morphē or Latin morphē meaning “form.” The compound was developed for the mineralogical sense of a substance that assumes the form of another through replacement. Related English words include “pseudonym,” from the same Greek element meaning “false,” and “morphology” and “metamorphosis,” which derive from the element meaning “form.”
Related word forms
How pseudomorph is actually used
The word is most common in mineralogy and geology, where it describes a replacement mineral that retains the crystal shape of the original substance. In figurative use, it is formal and comparatively uncommon.