Pseudomorphs are minerals that have taken on the shape of another mineral while retaining their original chemical composition. This process occurs when one mineral replaces another, often due to changes in environmental conditions, such as temperature or pressure. The result is a mineral that looks like a different one, but is chemically distinct. A common example of a pseudomorph is malachite replacing azurite. In this case, the malachite takes on the blue color and crystal form of azurite, creating a unique specimen. Pseudomorphs are of interest to mineral collectors and geologists because they provide insights into geological processes and the history of mineral formation.