1. Rocks that have undergone propylitization, a type of hydrothermal alteration in which minerals are replaced by chlorite, epidote, and other secondary minerals.
Usage: geology; plural form; singular is propylite

Examples

• Geologists identified propylites in the ore deposit, indicating past hydrothermal activity.
• The propylites surrounding the copper vein showed characteristic green and gray coloration.
• Propylitization of the host rock created propylites that are useful indicators of mineralization.
• The mining team studied the propylites to understand the conditions of ore formation.