Pyrite nodule, originally identified as marcasite, collected from Farnham, Hampshire, from Lower Chalk, chalk marl formation, Cretaceous

Pyrite nodule, originally identified as marcasite, collected from Farnham, Hampshire, from Lower Chalk, chalk marl formation, Cretaceous
Pyrite nodule, originally identified as marcasite, collected from Farnham, Hampshire, from Lower Chalk, chalk marl formation, Cretaceous