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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 Blacknite Iridescent Covelline & Bornite Ferro Coated Quartz Cluster x 1 From Ambositra, Madagascar

Natural Blacknite Iridescent Covelline & Bornite Ferro Coated Quartz Cluster x 1 From Ambositra, Madagascar

R 418.00 ZAR
Natural Blacknite Iridescent Ferro Goethite With Covelline & Bornite Coated Quartz Cluster x 1 From Ambositra, Madagascar

Natural Blacknite Iridescent Ferro Goethite With Covelline & Bornite Coated Quartz Cluster x 1 From Ambositra, Madagascar

R 695.00 ZAR
Natural Blacknite Iridescent Covelline & Bornite Ferro Coated Quartz Clusters x 3 From Ambositra, Madagascar - TopRock

Natural Blacknite Iridescent Covelline & Bornite Ferro Coated Quartz Clusters x 3 From Ambositra, Madagascar

R 418.00 ZAR
Natural Extra Large Colourful Blacknite Iridescent Covelline & Bornite Ferro Coated Quartz Cluster x 1 From Ambositra, Madagascar - TopRock

Natural Extra Large Colourful Blacknite Iridescent Covelline & Bornite Ferro Coated Quartz Cluster x 1 From Ambositra, Madagascar

R 2,283.00 ZAR
Natural Blacknite Iridescent Covelline & Bornite Ferro Coated Quartz Cluster x 1 From Ambositra, Madagascar - TopRock

Natural Blacknite Iridescent Covelline & Bornite Ferro Coated Quartz Cluster x 1 From Ambositra, Madagascar

R 610.00 ZAR
Polished  Medium Ammolite 'opalised' Fossil Ammonites x 2 From Madagascar - TopRock

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

R 1,199.00 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 Ammolite Opalised Iridescent Cleoniceras Fossil Ammonite Specimen x 1  from Tulear, Madagascar - TopRock

Natural Ammolite Opalised Iridescent Cleoniceras Fossil Ammonite Specimen x 1 from Tulear, Madagascar

R 654.00 ZAR
Natural Iridescent Ammonite & White Spined Ammonite Fossils x 2 From Madagascar - TopRock

Natural Iridescent Ammonite & White Spined Ammonite Fossils x 2 From Madagascar

R 719.00 ZAR
Polished Iridescent Ammonite Fossil x 1 From Madagascar - TopRock

Polished Iridescent Ammonite Fossil x 1 From Madagascar

R 821.00 ZAR
Polished Large Opalised Ammonite Natural Ammolite Cleoniceras Stone Sealed Fossil x 1 From Tulear, Madagascar - TopRock

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

R 700.00 ZAR
Polished Red & Purple Ammolite Opalised Ammonite Fossils x 2 From Madagascar - TopRock

Polished Red & Purple Ammolite Opalised Ammonite Fossils x 2 From Madagascar

R 800.00 ZAR
Polished Ammolite Opalised Ammonite Specimens x 3 From Madagascar - TopRock

Polished Ammolite Opalised Ammonite Specimens x 3 From Madagascar

R 742.00 ZAR
Polished Ammonite Fossils With Ammolite Reflection x 3 From Madagascar - TopRock

Polished Ammonite Fossils With Ammolite Reflection x 3 From Madagascar

R 1,114.00 ZAR
Polished Ammonite Whole With Ammolite Shells, Larger One Has Nice Red Ammolite Opal Reflection x 2 From Madagascar - TopRock

Polished Ammonite Whole With Ammolite Shells, Larger One Has Nice Red Ammolite Opal Reflection x 2 From Madagascar

R 1,032.00 ZAR
Polished Ammolite Opalised Cleoniceras Ammonite Fossils x 2 From Tulear, Madagascar - TopRock

Polished Ammolite Opalised Cleoniceras Ammonite Fossils x 2 From Tulear, Madagascar

R 1,315.00 ZAR
Natural Blacknite Iridescent Ferro Goethite With Covelline & Bornite Coated Quartz Specimens x 2 From Ambositra, Madagascar - TopRock

Natural Blacknite Iridescent Ferro Goethite With Covelline & Bornite Coated Quartz Specimens x 2 From Ambositra, Madagascar

R 476.00 ZAR
Natural Blacknite Iridescent Ferro Goethite With Covelline & Bornite Coated Quartz Cluster x 1 From Ambositra, Madagascar - TopRock

Natural Blacknite Iridescent Ferro Goethite With Covelline & Bornite Coated Quartz Cluster x 1 From Ambositra, Madagascar

R 519.00 ZAR
Natural Blacknite Iridescent Ferro Goethite With Covelline & Bornite Coated Quartz Specimen x 1 From Ambositra, Madagascar - TopRock

Natural Blacknite Iridescent Ferro Goethite With Covelline & Bornite Coated Quartz Specimen x 1 From Ambositra, Madagascar

R 467.00 ZAR
Natural Extra Large Blacknite Quartz Iridescent Goethite Cluster x 1 From Ambositra, Madagascar - TopRock

Natural Extra Large Blacknite Quartz Iridescent Goethite Cluster x 1 From Ambositra, Madagascar

R 19,117.00 ZAR
Natural Blacknite Iridescent Ferro Goethite With Covelline & Bornite Coated Quartz Specimen x 1 From Ambositra, Madagascar - TopRock

Natural Blacknite Iridescent Ferro Goethite With Covelline & Bornite Coated Quartz Specimen x 1 From Ambositra, Madagascar

R 348.00 ZAR
Natural Blacknite Iridescent Ferro Goethite With Covelline & Bornite Coated Quartz Cluster x 1 From Ambositra, Madagascar - TopRock

Natural Blacknite Iridescent Ferro Goethite With Covelline & Bornite Coated Quartz Cluster x 1 From Ambositra, Madagascar

R 673.00 ZAR
Polished Opalised Ammonite With x 5 Skull Carvings x 1 From Madagascar - TopRock

Polished Opalised Ammonite With x 5 Skull Carvings x 1 From Madagascar

R 1,682.00 ZAR
Polished Fossil Nautilus Opalised Skull Carving x 1 From Tulear, Madagascar - TopRock

Polished Fossil Nautilus Opalised Skull Carving x 1 From Tulear, Madagascar

R 1,230.00 ZAR
Polished Ammonite & Nautilus With Ammolite Skull Carvings x 2 From Madagascar - TopRock

Polished Ammonite & Nautilus With Ammolite Skull Carvings x 2 From Madagascar

R 992.00 ZAR
Polished Fossil Nautilus Skull Carvings, One Opalised x 2 From Madagascar - TopRock

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

R 1,253.00 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 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
Natural Iridescent Full Ammonite Fossil x 1 From Madagascar - TopRock

Natural Iridescent Full Ammonite Fossil x 1 From Madagascar

R 933.00 ZAR
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