Ammolite is an opal-like organic gemstone found primarily along the eastern slopes of the Rocky Mountains of North America. It is a thin iridescent aragonite shell material that is found on two species of extinct ammonite fossils; the same mineral contained in nacre. Ammolite is one of few biogenic gemstones; others include amber and pearl.
Ammolite is also known as AAPOAK (the Kainai Nation word for "small, crawling stone"), "ammonite shell", "gem ammonite", "calcentine", and "korite". The latter is a trade name given to the gemstone by the Alberta-based Canada mining company Korite International, the first and largest commercial producer of ammolite.
Placenticeras Ammolite specimen, from Bearpaw Formation en.wikipedia.org Fine ammolite jewelry by Korite International en.wikipedia.org
