View MapLot 343 | EXCEPTIONAL GEMSTONE AMMONITE
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EXCEPTIONAL GEMSTONE AMMONITE
Placenticeras meeki
Upper Cretaceous
Bearpaw formation, Alberta, Canada
Gemstone ammolite is one of the rarest gemstones in the world, formed from the nacreous shell linings of Cretaceous ammonites in only one small area of North America. It is prized for its fantastic display of shimmering colors, created by impurities in the incredibly thin layers of aragonite. This specimen has a full covering of multi-colored iridescence on both sides, flashing with red and green and gold. Remarkably, however, it also displays large areas of the much rarer purple and electric blue colors, produced by the very thinnest (>5mm) aragonite layers. It is because of such quantity and quality of these rare colors that makes this specimen one of the rarest on the world. In addition, these fossils are most commonly found crushed flat but the present example retains areas of excellent three-dimensionality and detail. A superb specimen, it measures 20 1/4 inches wide.
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