A first finding of the framboidal pyrite in the nummulite shell from the simferopolskaya formation (Eocene) of mountain Crimea
Journal: SHILAP Revista de lepidopterología
Year: 2016

The paper considers the data, concerning the studying of the pyritized shell Nummulites sp. from the nummulite limestones of simferopolskaya formation (Eocene), referred to the nummulite zones Nummulites nemkovi, N. distans и N. polygyratus. The pyrites of two generations are discovered. The first one is the earliest diagenetic framboidal pyrite, connected with the crystallization of the amorphous iron sulfides, and the second one is an idiomorphic pyrite, which forms the aggregates in a form of