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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.

Polished Fossil Nautilus Skull Carvings, One Opalised x 2 From Madagascar

Polished Fossil Nautilus Skull Carvings, One Opalised x 2 From Madagascar

R 1,253.00 ZAR
Polished Opalised Ammonite With Skull Carving With Some Nice Ammolite On Shell  x 1 From Tulear, Madagascar

Polished Opalised Ammonite With Skull Carving With Some Nice Ammolite On Shell x 1 From Tulear, Madagascar

R 3,816.00 ZAR
Polished Ammonite Skull Carvings Opalised Nautilus Shell On One & 1 Ammonite x 2 From Madagascar - TopRock

Polished Ammonite Skull Carvings Opalised Nautilus Shell On One & 1 Ammonite x 2 From Madagascar

R 974.00 ZAR
Polished Opalised Ammonite With Skull Carving x 1 From Tulear, Madagascar - TopRock

Polished Opalised Ammonite With Skull Carving x 1 From Tulear, Madagascar

R 1,949.00 ZAR
Polished Exquisite Extra Extra Large Opalised Ammonite Skull Sculpture x 1 From Mahajanga, Madagascar - TopRock

Polished Exquisite Extra Extra Large Opalised Ammonite Skull Sculpture x 1 From Mahajanga, Madagascar

R 7,788.00 ZAR
Polished & Cut Ammonite Opalised Fossil Pair x 1 Pair  From Tulear, Madagascar - TopRock

Polished & Cut Ammonite Opalised Fossil Pair x 1 Pair From Tulear, Madagascar

R 1,253.00 ZAR
Polished Ammonite Skull Carvings One With Opalised Nautilus x 6 From Madagascar - TopRock

Polished Ammonite Skull Carvings One With Opalised Nautilus x 6 From Madagascar

R 2,075.00 ZAR
Polished Opalised Nautilus Skull Carving x 1 From Madagascar - TopRock

Polished Opalised Nautilus Skull Carving x 1 From Madagascar

R 1,169.00 ZAR
Polished Opalised Fossil Nautilus Skull Carvings x 1 From Mahajanga, Madagascar - TopRock

Polished Opalised Fossil Nautilus Skull Carvings x 1 From Mahajanga, Madagascar

R 1,253.00 ZAR
Polished Ammolite Opalization & 4 Skulls x 1 From Madagascar - TopRock

Polished Ammolite Opalization & 4 Skulls x 1 From Madagascar

R 1,595.00 ZAR
Polished Opalised Nautilus Classic Skull Carving x 1 From Madagascar - TopRock

Polished Opalised Nautilus Classic Skull Carving x 1 From Madagascar

R 1,786.00 ZAR
Polished Opalised Nautilus Skull Carving x 1 From Madagascar - TopRock

Polished Opalised Nautilus Skull Carving x 1 From Madagascar

R 1,754.00 ZAR
Polished Large Cut & Fossilised Cleoniceras Ammonite Pair With Iridescent Shell x  1 Pair  From Madagascar - TopRock

Polished Large Cut & Fossilised Cleoniceras Ammonite Pair With Iridescent Shell x 1 Pair From Madagascar

R 1,056.00 ZAR
Polished Ammolite Cleoniceras Ammonite Fossil x 1 From Madagascar - TopRock

Polished Ammolite Cleoniceras Ammonite Fossil x 1 From Madagascar

R 1,346.00 ZAR
Polished Cut Cleoniceras Ammonite With Iridescent Shell & Nice Spiral Centres x Pairs x 2 From Mahajanga, Madagascar - TopRock

Polished Cut Cleoniceras Ammonite With Iridescent Shell & Nice Spiral Centres x Pairs x 2 From Mahajanga, Madagascar

R 998.00 ZAR
Polished Large Cleoniceras Ammonite 3 Pyrite Nodules & Slight Ammolite Opalization x 1 From Madagascar - TopRock

Polished Large Cleoniceras Ammonite 3 Pyrite Nodules & Slight Ammolite Opalization x 1 From Madagascar

R 864.00 ZAR
Polished Ammonite Opalised Nautilus Fossil Skull Carving  x 1 From Madagascar - TopRock

Polished Ammonite Opalised Nautilus Fossil Skull Carving x 1 From Madagascar

R 1,056.00 ZAR
Polished Purple & Red Reflection Ammolite Opalised Ammonite Fossil x 1 From Tulear, Madagascar - TopRock

Polished Purple & Red Reflection Ammolite Opalised Ammonite Fossil x 1 From Tulear, Madagascar

R 545.00 ZAR
Natural Iridescent Full Ammonite Fossil x 1 From Madagascar - TopRock

Natural Iridescent Full Ammonite Fossil x 1 From Madagascar

R 933.00 ZAR
Polished Cut Ammonite Pair & Iridescent Full Ammonite Fossils x 2 From Tulear, Madagascar - TopRock

Polished Cut Ammonite Pair & Iridescent Full Ammonite Fossils x 2 From Tulear, Madagascar

R 858.00 ZAR
Polished Opalised Ammonite Fossil x 1 From Tulear, Madagascar - TopRock

Polished Opalised Ammonite Fossil x 1 From Tulear, Madagascar

R 2,297.00 ZAR
Polished Red & Purple Ammolite Opalised Cleoniceras Ammolite Fossil x 1 From Tulear, Madagascar - TopRock

Polished Red & Purple Ammolite Opalised Cleoniceras Ammolite Fossil x 1 From Tulear, Madagascar

R 1,290.00 ZAR
Natural Iridescent Ammonite Fossil x 1 From Madagascar - TopRock

Natural Iridescent Ammonite Fossil x 1 From Madagascar

R 846.00 ZAR
Polished Cut Ammonite Pairs With Ammolite On Outer Shells x 5 pairs From Madagascar - TopRock

Polished Cut Ammonite Pairs With Ammolite On Outer Shells x 5 pairs From Madagascar

R 626.00 ZAR
Natural Iridescent Ammonite Fossils x 2 From Madagascar - TopRock

Natural Iridescent Ammonite Fossils x 2 From Madagascar

R 1,021.00 ZAR
Natural Fossil Ammonite With Iridescent Shell x 1 From Madagascar - TopRock

Natural Fossil Ammonite With Iridescent Shell x 1 From Madagascar

R 451.00 ZAR
Polished Iridescent Full Ammonite Fossil x 1 From Tulear, Madagascar - TopRock

Polished Iridescent Full Ammonite Fossil x 1 From Tulear, Madagascar

R 603.00 ZAR
Polished Cut Ammonite Pairs With Iridescent Outer Shells x 2 From Tulear, Madagascar - TopRock

Polished Cut Ammonite Pairs With Iridescent Outer Shells x 2 From Tulear, Madagascar

R 1,002.00 ZAR
Natural Iridescent Ammonite Fossil x 1 From Madagascar - TopRock

Natural Iridescent Ammonite Fossil x 1 From Madagascar

R 574.00 ZAR
Natural Iridescent Ammonite Fossil x 1 From Mainterano, Madagascar - TopRock

Natural Iridescent Ammonite Fossil x 1 From Mainterano, Madagascar

R 487.00 ZAR
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