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

R 1,044.00 ZAR
  • Natural Large Iridescent & Cut & Polished Ammonite Fossil Pair x 2 From Tulear, Madagascar - TopRock

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

R 1,044.00 ZAR
A lovely Ammonite which have variable features including crystalline, sediment or calcified segments. Grading cut ammonites is always a very difficult task. The fact that these wonderful fossils have been so well preserved for millions on years is just exceptional in itself. However, when segments are less distinctive, or have calcite infills without crystalline vugs the grade tends to be negatively impacted. Higher graded material will have clearly distinctive segments, crystalline areas, and often a mix of calcite infills or sedimentary infills. Grading of pieces is often quite subjective as features which are "Lower quality" are often the appealing qualities for other buyers. Ammonites from Madagascar tend to be Triassic to Cretaceous in age, with several different species being available sporadically.

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.

Price is grade dependent. Items are as shown.

Locality = Tulear, Madagascar
Grade = Good Grade
Size = 153 - 173 mm | 6 - 6.8 inch
Nett Weight = 1.8 Kg | 3.9 Lbs

Product Type = Small Batch

SKU = A57735AMMO

Currently 1 in stock.

Please Note: The product title specifies the exact number of pieces included for the listed product price e.g. x 12, x 1, x 35 etc. The vast majority of our products are individually graded batches or single pieces which are priced accordingly. Therefore, if we state “Currently 1 in stock” this means we have 1 batch and/or 1 piece available as per the number of pieces indicated in the product title.

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  • Description
A lovely Ammonite which have variable features including crystalline, sediment or calcified segments. Grading cut ammonites is always a very difficult task. The fact that these wonderful fossils have been so well preserved for millions on years is just exceptional in itself. However, when segments are less distinctive, or have calcite infills without crystalline vugs the grade tends to be negatively impacted. Higher graded material will have clearly distinctive segments, crystalline areas, and often a mix of calcite infills or sedimentary infills. Grading of pieces is often quite subjective as features which are "Lower quality" are often the appealing qualities for other buyers. Ammonites from Madagascar tend to be Triassic to Cretaceous in age, with several different species being available sporadically.

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.

Price is grade dependent. Items are as shown.

Locality = Tulear, Madagascar
Grade = Good Grade
Size = 153 - 173 mm | 6 - 6.8 inch
Nett Weight = 1.8 Kg | 3.9 Lbs

Product Type = Small Batch