1. converted into or containing pyrite; having undergone pyritisation (a geological process in which organic material is replaced by iron sulfide minerals)
Usage: geology; chiefly British spelling (American: pyritized)

Examples

• The fossil was pyritised, with its original shell replaced by iron sulfide.
• Pyritised ammonites are prized by collectors for their metallic luster.
• The sedimentary layer contained pyritised remains of ancient organisms.
• Under the microscope, the pyritised structure revealed fine details of the original specimen.