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Pseudomorph
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{{Short description|Mineral or mineral compound that appears in an atypical form}} [[File:Silica pseudomorph after gypsum crystals and silicified serpulid polychaete tubes.jpg|thumb|[[Silica]] pseudomorph after [[gypsum]] crystals and silicified [[serpulid]] [[polychaete]] tubes]] [[File:Goethite-Pyrite-44341.jpg|thumb|Pseudomorph of [[goethite]] after [[pyrite]] ]] In [[mineralogy]], a '''pseudomorph''' is a [[mineral]] or mineral compound that appears in an atypical form ([[crystal system]]), resulting from a substitution process in which the appearance and dimensions remain constant, but the original mineral is replaced by another due to alteration, or chemical substitution, dissolution and refilling, structural changes or incrustation.<ref>{{Cite journal |last1=Fraile Rodrigo |first1=Jesús |last2=Calvo Rebollar |first2=Miguel |date=2019 |title=Pseudomorphs: when the mineral is not what is was |url=https://doi.org/10.5281/zenodo.3674630 |journal=Mineral up |volume=5 |issue=3 |pages=8–30 |doi=10.5281/zenodo.3674630}}</ref> The name literally means "false form". Terminology for pseudomorphs is "''replacer'' after ''original''", as in ''brookite'' after ''rutile''. The term ''pseudomorphoses'' was initially used by Haüy.<ref>{{Cite book |last=Haüy |first=René Just |author-link=René Just Haüy |title=Traité de Mineralogie |publisher=Chez Louis |year=1801 |volume=2 |pages=140–145}}</ref>
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