Rare Iridescent Ammonite

Fossilised Ammolite in grey slate
Placenticeras intercalare
Upper Cretaceous (75-72 million years ago)
70 x 62 x 4 cm
Alberta, Canada

Known as ‘Ammolite’, the shimmering, metallic colours were caused by the combination of millions of years of compression and the mineralization of iron, copper and silica which precipitated from volcanic ash. It is very rare to find a specimen with blue and purple hues.

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