Pseudomorph

A mineral that has replaced another while keeping the original's crystal form — goethite after pyrite, quartz after calcite, malachite after azurite. Named “X after Y”.

Sources

Earle, S. (2019). Physical Geology, 2nd ed., Chapter 2: Minerals (CC BY 4.0)
Mindat — Mineralogical glossary (link only)

Cite this article

Stratum Strata. "Pseudomorph" (Glossary). Stratum Strata pack 2026.09, as of 2026-09-16. https://stratum.black/strata/glossary/pseudomorph. Accessed 2026-09-21.

BibTeX · CSL-JSON

@misc{stratum-pseudomorph,
  title        = {Pseudomorph},
  author       = {{Stratum Strata}},
  howpublished = {\url{https://stratum.black/strata/glossary/pseudomorph}},
  year         = {2026},
  note         = {Glossary article, Stratum Strata pack 2026.09, as of 2026-09-16; sources: stratum. Accessed 2026-09-21.}
}

Citations carry the pack version and the article's as-of date so they resolve to the same text later. The facts themselves belong to the sources listed below; cite those for the science.