Fossilized Sectioned Ammonite (Cleoniceras) with Exquisite Aragonite and Calcite Mineralization - Perfect State of Preservation - Height: 210 mm - Width: 180 mm- 1761 g - (1)

Fine preservation of the internal chamber structure and rich mineral crystallizations — This exceptional specimen consists of a fossil ammonite of the genus Cleoniceras, sectioned and polished to reveal its magnificent internal structure. The identification of the genus Cleoniceras is supported by the typical complex sutures and the morphology of the shell, indicative of a cephalopod organism that lived during the Cretaceous period. The transverse section highlights the chambers (buoyancy chambers) separated by septa, a fundamental diagnostic feature for the classification of these marine invertebrates. The visual analysis reveals extraordinary fossilization with a rich variety of colors and textures. The internal chambers have been filled by secondary crystallizations of aragonite and calcite, ranging from honeyed and amber tones to translucent whites and pearly greys. The suture lines, once filled with sediment, are now outlined by a color contrast that enhances their intricate design. Small geodes studded with lucid microcrystals of calcite can also be observed inside some chambers, testifying to a highly complex and protracted secondary mineralization process. The origin of this specimen is Madagascar, a geologically renowned area for the production of exceptionally high-quality and well-preserved fossil ammonites. The formation context dates back to the Cretaceous period, an era roughly between 145 and 66 million years ago. During this period, Madagascar was part of an active marine environment conducive to ammonite life and subsequent fossilization, often with permineralization processes that preserve internal details. The aesthetic quality of this lot is remarkable, especially due to the perfect symmetry of the section and the shine of the polished surface, which maximizes color contrast and depth. The visibility of the internal chambers, complete with fine details, and the presence of multiple generations of aragonitic and calcitic crystallization make it a museum piece. The warm tones of brown and orange combined with white and grey create a harmonious and sophisticated visual impact. The preservation state is excellent, with no signs of significant damage or invasive restorations. The two halves fit together perfectly, a testament to careful sectioning and polishing work performed with precision. The surfaces are smooth and reflective, allowing a clear observation of the internal structures. The lot also includes the proper supports for display, enabling an elegant and stable presentation of the ammonite. From a collecting standpoint, a Cleoniceras ammonite that is sectioned and crystallized at this size and quality is highly sought after. Specimens displaying such structural integrity and rich internal mineralization are considered top pieces for any fossil or mineral collection. This lot offers not only an opportunity for paleontological study but also a object of great aesthetic beauty, merging geological history with the refined art of nature. Its Malagasy origin, combined with the magnificence of its fossilization, makes it a piece of notable educational and display value.