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. The name literally means "false form".

What is a pseudomorph mineral?

pseudomorph, mineral formed by chemical or structural change of another substance, though retaining its original external shape.

What is the meaning of Pseudomorphs?

1 : a mineral having the characteristic outward form of another species. 2 : a deceptive or irregular form.