PRODUCT INFORMATION

General Description

Ammolite is an opal-like organic gemstone found in various places in 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 a 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 “opalization” 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 is 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.

Product Data

Locality = Madagascar
Grade = Very Good to A Grade
Size = 114 x 72 x 99 mm | 4.5 x 2.8 x 3.9 inch
Net Weight = 1 Kg | 2.2 Lbs
Product Type = Décor Item