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Alla auktioner / Etnografica / Ancient fossilized ammonite sphere - Mosaic of Cretaceous...
Polished fossil specimen with notable shell inclusions — This exceptional specimen consists of a meticulously polished sphere, created from an aggregate of ammonite fossils of the genus Cleoniceras, dating to the Cretaceous period. Its smooth surface reveals an intricate internal weave, testimony to the fossilization and diagenetic processes that preserved these ancient cephalopods for millions of years. The specimen offers a window into the biological and mineralogical composition of the prehistoric marine habitat. The sphere’s composition features a matrix that encloses numerous fragments of ammonites, with cross-sections of the shells clearly showing the internal chambers (siphon and septa) filled with secondary minerals, mainly calcite and silica, which have taken on amber, brown, and ochre tones. The gloss of the polished surface enhances the contrast between the different inclusions and the surrounding matrix, creating a visual effect of deep complexity. Originating from Madagascar, an area renowned for its abundance and the remarkable preservation of Cretaceous marine fossils, this piece is an excellent example of local geological formations. The fossilization occurred through a slow process of mineral replacement, where organic parts were gradually replaced by minerals, keeping intact the delicate internal structures of the ammonite shells. The aesthetics of this sphere are particularly captivating, with a harmonious balance between the warm tones of brown and amber and the lighter accents of the shells’ internal sections. Sphere-cutting maximizes the exposure of these internal features, allowing observation from every angle and transforming a paleontological specimen into an object of refined design and collection. The density and distribution of ammonite inclusions are homogeneous, indicating a matrix rich in fossil remnants. The condition of preservation of the specimen is excellent, with no significant fractures or alterations that could compromise its structural or aesthetic integrity. The polishing has been carried out with mastery, ensuring a smooth and brilliant surface that enhances the natural beauty of the included fossils. A piece of such quality is highly desirable for collectors, amateur paleontologists, and gemology enthusiasts seeking unique and historically significant specimens. This object is not just a fossil, but a work of natural and geological art, combining scientific interest with a notable visual impact. It represents an opportunity to acquire a specimen that unites the history of life on Earth with the intrinsic beauty of minerals and fossil forms, making it a museum piece or a focal point for any collection of precious minerals and fossils.
Utropspris:SEK 2,824.24
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Utropspris:
SEK 2,824.24
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