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  • Cleoniceras Iridescent & Opalised Ammolite Ammonite 69mm
  • Cleoniceras Iridescent & Opalised Ammolite Ammonite 69mm

Cleoniceras Iridescent & Opalised Ammolite Ammonite 69mm


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The ammonite from Madagascar has an ammolite rainbow affected and iridescent surface, this caused in the deposition in the fossil bed developed over eons of time; naturally creating the fossilised shell into a beautiful mineralised and unique curiosity. The highly desirable opalised aragonite within the long chain molecules of the chitin shell, the mineral aragonite, cause this nacre on the surface of the prehistoric ammonite shell. Once polished the colours of the rainbow; if present, shines through. Read the full description below...

Genus: Cleoniceras ammonite, family Hoplitidae.
Age: Albian 100 to 113 m.y.a., Cretaceous period 135 to 65 m.y.a
Origin: N.E. Madagascar. E.Africa, South Indian Ocean

Cleoniceras ammonite measurements.
Width: 6.9 cm

Weight: 0.089 g

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Condition; Excellent ammolite specimen ammonite, worked to the central whorl, exhibiting fiery rainbow colour flashes in natural light, predominantly through iridescent red aragonite. The hand-polished natural phragmacone, still retaining the external ribbed form of the ancient molluscs fossilised shell under the polished surface.

Cleoniceras Sutured Ammonite unearthed by mining techniques, conserved and polished by hand and which has enabled the wonderful opportunity to discover the finest type of ammonites from Madagascar. One of the best locations to gain colourful ammonites with wonderful natural preservation with fine minerals and this example is no exception to that rule. The Cleoniceras ammonites from Madagascar particularly good specimens, the depositions of fossil beds have a unique quality and fossil from here are exceedingly desirable and collectable.

Rare colours found in specimens are maize yellow, amber, blue, glaucous, cerulean, purple, lavender, scarlet red, coral pink and lavender pink. These specimen ammolite ammonites from Madagascar are of a similar quality to the Canadian ammolite fossils, however where the Canadian ammolite is often not so stable it is normally coated with preservatives, a type of resin or lacquer finish, this particular specimen from Madagascar has been polished by hand on a polishing wheel and is very stable, a hard natural quartz surface honed and very tactile to touch. The colours of the rainbow can be seen in extremely good examples, this play of light, a refraction of natural light through layers of aragonite within the fossilised shell of the ammonite, create wonderful iridescence. This is what the collector is hoping to see, turning the ammolite in ones hand the colours vary with bright greens, reds, purples and blue hues among other flashes of colour. Each specimen is unique, often the ammolite shell is viewed as being so attractive it is broken up and used in jewellery manufacture.

Ammonites are part of the Ammonitida of marine invertebrates. With large eyes and remarkable vision, they could easily hunt prey at a depth where little or no light penetrates the deeper ocean. The Cephalopod would attain its prey using long tentacles. Prey such as other crustaceans and fish, much like the modern day Nautilus Pompilius which can be found in the Pacific and Indian oceans.

A few years ago off the Great Barrier Reef at depths between 200 to 400 meters, sightings of the Nautilus Pompilius were made, showing the pressures these Cephalopods can attain. The Ammonites extinction is dated around 74 million years, pre the great mass extinction of around 65 million years. Ammonites are important index fossils, it is often possible to link the sediment layer in which they are found to specific geological time periods. The largest ammonite to date is around 2.5 meters in diameter from Germany.