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3.8" Silver Iridescent Ammonite (Cleoniceras) Fossil - Madagascar
This beautiful, 3.8" wide ammonite fossil was collected near Mahajanga Province, Madagascar, and displays a shimmering silver iridescence. It belongs to the genus Cleoniceras, a marine ammonite that thrived in the region’s shallow Cretaceous seas roughly 110 million years ago. When viewed in the right light—or when the surface is wet—the fossil reveals a vivid, rainbow-like iridescent flash that highlights the natural beauty of its preserved shell.
The specimen includes an acrylic display stand.
The specimen includes an acrylic display stand.
About Silver Iridescent Ammonite Fossils
Silver iridescent ammonite fossils from Madagascar are striking cut-and-polished fossils that display a brilliant, metallic silver flash across their coiled chambers, often shifting to subtle blues and greens as the light moves. This shimmering effect is caused by ultra-thin, microscopic layers within parts of the shell or mineral replacement that act like a natural light prism, reflecting and amplifying certain wavelengths through interference. The result is a sleek, chrome-like iridescence that contrasts beautifully with crisp white calcite septa tracing elegant patterns through the spiral, making these specimens exceptional display pieces.
Ammonites are extinct marine mollusks related to modern nautiluses, squids, and octopuses that lived in Earth’s oceans from the Devonian through the end of the Cretaceous Period, when they disappeared alongside the dinosaurs. They built coiled, chambered shells, adding new chambers as they grew and using gas-filled compartments to help control buoyancy. Because ammonites evolved rapidly and were widespread, they are among the most important index fossils used by geologists to date and correlate rock layers around the world.
Silver iridescent ammonite fossils from Madagascar are striking cut-and-polished fossils that display a brilliant, metallic silver flash across their coiled chambers, often shifting to subtle blues and greens as the light moves. This shimmering effect is caused by ultra-thin, microscopic layers within parts of the shell or mineral replacement that act like a natural light prism, reflecting and amplifying certain wavelengths through interference. The result is a sleek, chrome-like iridescence that contrasts beautifully with crisp white calcite septa tracing elegant patterns through the spiral, making these specimens exceptional display pieces.
Ammonites are extinct marine mollusks related to modern nautiluses, squids, and octopuses that lived in Earth’s oceans from the Devonian through the end of the Cretaceous Period, when they disappeared alongside the dinosaurs. They built coiled, chambered shells, adding new chambers as they grew and using gas-filled compartments to help control buoyancy. Because ammonites evolved rapidly and were widespread, they are among the most important index fossils used by geologists to date and correlate rock layers around the world.
SPECIES
Cleoniceras sp.
LOCATION
Ambatolafia, Mahajanga Province, Madagascar
SIZE
3.8" wide
CATEGORY
SUB CATEGORY
ITEM
#346716
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