Describing a mineral that does not have a consistent crystal structure, meaning that it can transform back and forth into its paramorph when conditions are suitable. Monotropic minerals cannot transform back and forth into their paramorphs. Once they change, they cannot change back without the crystal structure being destroyed.

It is a term used to describe a mineral which do not have a consistent crystal structure i.e. it transform back and forth into its paramorph in suitable conditions. Monotropic minerals cannot transform. They change permanently.