pseudomorph

[soo-duh-mawrf]
noun
1.
an irregular or unclassifiable form.
2.
a mineral having the outward appearance of another mineral that it has replaced by chemical action.

Origin:
1840–50; pseudo- + -morph

pseudomorphic, pseudomorphous, adjective
pseudomorphism, noun
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World English Dictionary
pseudomorph (ˈsjuːdəʊˌmɔːf)
 
n
a mineral that has an uncharacteristic crystalline form as a result of assuming the shape of another mineral that it has replaced
 
pseudo'morphic
 
adj
 
pseudo'morphous
 
adj
 
pseudo'morphism
 
n

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Encyclopedia Britannica
Encyclopedia

pseudomorph

mineral formed by chemical or structural change of another substance, though retaining its original external shape. Although pseudomorphs give the appearance of being crystalline, they are commonly granular and waxy internally and have no regular cleavage; those that are crystalline have optical properties different from those required by their outward form

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Encyclopedia Britannica, 2008. Encyclopedia Britannica Online.
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Example sentences
The serpentine occurs typically in the form of a pseudomorph after diallage.
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