Description
Fossil, Ammolite Specimen mounted in a Riker Mount. A Riker mount is a shallow, glass-front display case commonly used by collectors and museums to safely showcase small specimens such as insects, minerals, fossils, or historical artifacts.
You will receive this specimen, or one like it.
Ammolite specimen in a Riker mount — an interestingly instructive overview
An ammolite specimen is one of Earth’s most dazzling organic gemstones — a shimmering fossilized shell that captures the colors of ancient oceans. When displayed in a Riker mount, this vibrant remnant of prehistory becomes both a geological marvel and a captivating educational piece.
1) What ammolite is
Ammolite is the fossilized shell of extinct marine ammonites, relatives of modern squids and nautiluses that lived about 70–75 million years ago during the Late Cretaceous period. Over eons, the shell’s original aragonite layers — rich in calcium carbonate — were preserved and compacted, retaining their natural iridescent structure.
2) The science behind the color
Ammolite’s brilliant rainbow hues come not from pigments but from optical interference — light bouncing through ultra-thin layers of aragonite crystal.
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Red and green colors form from slightly thicker layers.
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Blue and violet tones appear when the layers are thinner, a rare and prized phenomenon.
Under magnification, these microstructures resemble natural diffraction gratings — a vivid lesson in both paleontology and physics.
3) Geological origin
Most gem-quality ammolite comes from the Bearpaw Formation of southern Alberta, Canada — once a shallow inland sea teeming with ammonites. These shells were buried in marine sediments, later uplifted and exposed by erosion, creating the only major ammolite deposit on Earth.
4) The Riker mount display
A Riker mount — a slim, glass-fronted display case with a soft cotton or foam backing — provides an ideal setting for a fragile ammolite piece.
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Protection: Shields the iridescent surface from moisture, dust, and handling damage.
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Presentation: Black background contrasts beautifully with ammolite’s rainbow sheen.
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Labeling: Include details like “Ammolite (fossilized ammonite shell), Bearpaw Formation, Late Cretaceous, Alberta, Canada.”
5) Why this specimen is fascinating
An ammolite specimen bridges ancient marine life and modern gemology. It’s both a fossil and a gemstone — born of biology, transformed by geology, and celebrated for its optical brilliance. Housed in a Riker mount, it becomes a miniature museum — a slice of deep time shimmering in iridescent color.
Fossil, Amber Specimen with Insect Inclusion, Mounted in a Riker Mount
