05227 - Beautiful Pyritized 0.86 Inch Phylloceras Lower Cretaceous Ammonites Neltneria Nice and big specimen

Nice and big specimen

See also Kumar and Loyal 1987

Brochantitie forms mainly in exposed areas where weathering prevents accumulation copper ions and enhancement in the acidity of water films

Coexistence of native Fe and Fe-Ni alloys

Although in their alveoli

05227 - Beautiful Pyritized 0.86 Inch Phylloceras Lower Cretaceous Ammonites Neltneria Nice and big specimenSpecimen of extreme quality. His suture lines are wonderfully well detailed. It is naturally pyritized. It has undergone a taphonomic process of permineralization in Iron Sulfide (Pyrite). Permineralization is a process of fossilization in which mineral deposits form internal casts of organisms.