Tesaurus d'Art i Arquitectura Getty Institute 0000-00-00 2024-01-24 15:40:44 en pyrite300011112fool's goldiron pyritepyrites A common yellowish isometric mineral made of iron disulfide. It is reflective and its sparkling nuggets have been mistaken for gold. Pyrite may be incorporated into fossil deposits. Under conditions of high humidity the mineral may oxidize and form iron sulfate. This oxidation product expands and causes fossil specimens to fracture and crumble in a condition known as "pyrite disease," or "pyrite decay." pirita pirita 2026-03-30 20:32:54