Ammonite Rondiceras Fossil | Natural Pyritized Fossilized | Upper Jurassic | Mikhailov, Riazan Region, Russia | SO24 Hematite This is a must have

This is a must have 13

in the Congo (Zaire) produce Malachite in all sorts of odd shapes and forms

Of interest

Its dimensions are 113x42x34mm

Origin: Mined in Reaphook Hill

Ammonite Rondiceras Fossil | Natural Pyritized Fossilized | Upper Jurassic | Mikhailov, Riazan Region, Russia | SO24 Hematite This is a must haveA superb example of pyritized ammonites of the genera Kosmoceras, Quenstedticeras and others of the Callovian Stage (161 m. y. a) deposits of Russia. The high degree of preservation of natural mother of pearl shell makes it appear to be preserved as fire opal. This is a consequence of light passing through the various layers of aragonite and conchiolin deposited by the ammonite in life. The lack of acidity in the depositional environment allowed them