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  • Fossil - Ammonite - Ammolite / Iredescent

Fossil - Ammonite - Ammolite / Iredescent

Ammonites were squid-like creatures with sharp, beak-like jaws which had a wide range of shell morphologies (as show in the below image). Ammonites first appeared in the fossil record during the Devonian period some 400 Million years ago, and went extinct at the same time as the dinosaurs at the end of the Mesozoic.

In the mineral and gem worlds the term ammolite is the trade name for the iridescent, nacreous layer of the shell of fossilized ammonite. Ammolite is an opal-like organic gemstone found in various placed in the North America and Madagascar. Ammolite is made of the fossilized shells of ammonites, which in turn are composed primarily of aragonite. The microstructure of the mineral is inherited from the shell. It is one of few biogenic gemstones. Other more commonly known biogenic gemstones include amber and pearl. Ammolite was officially recognised as gemstone species in 1981. The chemical composition of ammolite is highly variable, and apart from aragonite it may also include calcite, silica, pyrite, or other minerals. Additionally – other trace elements have been reported such as aluminium; barium; chromium; copper; iron; magnesium; manganese; strontium; titanium; and vanadium. Ammolite “opalisation” is a term used to express the similarity between the two minerals due to the spectrum of colours it displays. Red and green are fairly common, whilst, blue or purple are rare due to the latter's fragility. Grading of ammolite if largely based on the number and intensity of colours visible, with lower grade material being comparatively dull with less dominant colours.

Natural Small Iridescent Ammonite Fossils x 12 From Madagascar

Natural Small Iridescent Ammonite Fossils x 12 From Madagascar

R 578.00 ZAR
Natural Large Iridescent Ammonite Fossil x 1 From Madagascar

Natural Large Iridescent Ammonite Fossil x 1 From Madagascar

R 554.00 ZAR
Natural Small Selected Iridescent Ammonite Fossils x 24 From Tulear, Madagascar

Natural Small Selected Iridescent Ammonite Fossils x 24 From Tulear, Madagascar

R 1,002.00 ZAR
Polished  Medium Opalised Ammonite Whole Fossils x 3 From Tulear, Madagascar

Polished Medium Opalised Ammonite Whole Fossils x 3 From Tulear, Madagascar

R 680.00 ZAR
Natural Small to Medium Iridescent Ammonite Fossils x 6 From Tulear, Madagascar

Natural Small to Medium Iridescent Ammonite Fossils x 6 From Tulear, Madagascar

R 673.00 ZAR
Natural Large Iridescent Ammonite Fossil x 1 From Tulear, Madagascar

Natural Large Iridescent Ammonite Fossil x 1 From Tulear, Madagascar

R 603.00 ZAR
Natural Medium Iridescent Ammonite Fossils x 2 From Tulear, Madagascar

Natural Medium Iridescent Ammonite Fossils x 2 From Tulear, Madagascar

R 451.00 ZAR
Natural  Medium Iridescent Ammonite Fossils x 6 From Tulear, Madagascar

Natural Medium Iridescent Ammonite Fossils x 6 From Tulear, Madagascar

R 619.00 ZAR
Natural  Small Iridescent Whole Ammonite Fossils x 13 From Tulear, Madagascar

Natural Small Iridescent Whole Ammonite Fossils x 13 From Tulear, Madagascar

R 800.00 ZAR
Natural Large Iridescent & Cut & Polished Ammonite Fossil Pair x 2 From Tulear, Madagascar

Natural Large Iridescent & Cut & Polished Ammonite Fossil Pair x 2 From Tulear, Madagascar

R 1,044.00 ZAR
Polished  Large Iridescent Cut & Polished Ammonite Fossils With Pyrite & Opalised Whole Ammonite x 2 From Tulear, Madagascar

Polished Large Iridescent Cut & Polished Ammonite Fossils With Pyrite & Opalised Whole Ammonite x 2 From Tulear, Madagascar

R 1,253.00 ZAR
Natural Small Iridescent Ammonite Fossils x 12 From Tulear, Madagascar

Natural Small Iridescent Ammonite Fossils x 12 From Tulear, Madagascar

R 529.00 ZAR
Natural Large Iridescent Ammonite Fossils x 6 From Tulear, Madagascar

Natural Large Iridescent Ammonite Fossils x 6 From Tulear, Madagascar

R 884.00 ZAR
Natural Medium Iridescent Ammonite Fossils x 6 From Tulear, Madagascar

Natural Medium Iridescent Ammonite Fossils x 6 From Tulear, Madagascar

R 508.00 ZAR
Polished Large Opalised Ammonite Natural Ammolite Cleoniceras Stone Sealed Fossil x 1 From Tulear, Madagascar

Polished Large Opalised Ammonite Natural Ammolite Cleoniceras Stone Sealed Fossil x 1 From Tulear, Madagascar

R 700.00 ZAR
Polished Cut & Polished Ammonite Cleoniceras With Ammolite Fossil Pairs x 2 From Tulear, Madagascar

Polished Cut & Polished Ammonite Cleoniceras With Ammolite Fossil Pairs x 2 From Tulear, Madagascar

R 1,127.00 ZAR
Polished Full Iridescent Ammonite Stone Sealed Ammolite Opalization Fossils x 2 From Madagascar

Polished Full Iridescent Ammonite Stone Sealed Ammolite Opalization Fossils x 2 From Madagascar

R 1,265.00 ZAR
Polished  Small Ammolite 'opalised' Fossil Ammonites x 6 From Madagascar

Polished Small Ammolite 'opalised' Fossil Ammonites x 6 From Madagascar

R 787.00 ZAR
Polished  Small Ammolite 'opalised' Fossil Ammonites x 6 From Madagascar

Polished Small Ammolite 'opalised' Fossil Ammonites x 6 From Madagascar

R 665.00 ZAR
Polished  Medium  Ammolite 'opalised' Fossil Ammonites x 3 From Madagascar

Polished Medium Ammolite 'opalised' Fossil Ammonites x 3 From Madagascar

R 642.00 ZAR
Polished  Medium Ammolite 'opalised' Fossil Ammonites x 2 From Madagascar

Polished Medium Ammolite 'opalised' Fossil Ammonites x 2 From Madagascar

R 1,095.00 ZAR
Polished  Medium Ammolite 'opalised' Fossil Ammonites x 2 From Madagascar

Polished Medium Ammolite 'opalised' Fossil Ammonites x 2 From Madagascar

R 1,097.00 ZAR
Polished  Medium Ammolite 'opalised' Fossil Ammonites x 2 From Madagascar

Polished Medium Ammolite 'opalised' Fossil Ammonites x 2 From Madagascar

R 1,199.00 ZAR
Polished  Medium Ammolite 'opalised' Fossil Ammonites x 2 From Madagascar

Polished Medium Ammolite 'opalised' Fossil Ammonites x 2 From Madagascar

R 1,449.00 ZAR
Polished  Medium Ammolite 'opalised' Fossil Ammonites x 6 From Madagascar

Polished Medium Ammolite 'opalised' Fossil Ammonites x 6 From Madagascar

R 1,977.00 ZAR
Polished  Medium to Large Ammolite 'opalised' Fossil Ammonite x 1 From Madagascar

Polished Medium to Large Ammolite 'opalised' Fossil Ammonite x 1 From Madagascar

R 785.00 ZAR
Polished  Medium to Large Ammolite 'opalised' Fossil Ammonite x 1 From Madagascar

Polished Medium to Large Ammolite 'opalised' Fossil Ammonite x 1 From Madagascar

R 957.00 ZAR
Polished Medium to Large Ammolite 'opalised' Fossil Ammonite x 1 From Madagascar

Polished Medium to Large Ammolite 'opalised' Fossil Ammonite x 1 From Madagascar

R 1,139.00 ZAR
Polished  Medium to Large Ammolite 'opalised' Fossil Ammonite x 1 From Madagascar

Polished Medium to Large Ammolite 'opalised' Fossil Ammonite x 1 From Madagascar

R 610.00 ZAR
Polished Medium to Large Ammolite 'opalised' Fossil Ammonites x 2 From Madagascar

Polished Medium to Large Ammolite 'opalised' Fossil Ammonites x 2 From Madagascar

R 1,014.00 ZAR
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