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

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

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

R 787.00 ZAR
' 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 = Madagascar
Grade = Good to Very Good Grade
Size = 85 - 98 mm | 3.3 - 3.9 inch
Nett Weight = 1.1 Kg | 2.5 Lbs

Product Type = Small Tray

SKU = A50970OPAM

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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' 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 = Madagascar
Grade = Good to Very Good Grade
Size = 85 - 98 mm | 3.3 - 3.9 inch
Nett Weight = 1.1 Kg | 2.5 Lbs

Product Type = Small Tray