1. Plural of pseudomorphism; instances in which a mineral assumes the external form of another mineral species, typically through alteration or replacement while retaining the original crystal structure internally.
Usage: mineralogy; technical term; geology
2. In biology and taxonomy, instances of structural or morphological similarity between organisms that is not due to close evolutionary relationship; false resemblance.
Usage: biology; rare usage

Examples

• The geologist identified several pseudomorphisms in the rock sample where limonite had replaced the original pyrite.
• Pseudomorphisms of quartz after feldspar are common in certain metamorphic rocks.
• The museum's mineral collection includes excellent examples of pseudomorphisms showing mineral replacement over geological time.
• Researchers studied pseudomorphisms to understand the alteration history of the ore deposit.
• The pseudomorphisms in this specimen preserve the cubic form of the original mineral despite complete chemical replacement.