A stunning example of an iridescent ammonite fossil of the species Caloceras johnstoni from North Somerset, UK.
The matrix measures 60 mm (2.4 inches) across and the ammonite measures 41 mm (1.6 inches).
It is preserved in one of two pieces of shale which was split open perfectly to reveal both the positive (shell) and negative (impression) of the fossil. This is very unusual with these fossils as they don't normally split open like this. The two pieces fit back together to hide the surprise inside! These make wonderful gifts for the curious of mind.
The ammonite is very well preserved and has been prepared out of the rock to reveal the full shell, which displays some beautiful iridescence with deep green, blue, and gold colours that change as the viewing angle changes.
These fossils are highly sought after and very hard to find. They are preserved in the same way as the famous Canadian "Ammolite" ammonites that are turned into valuable gemstones. The combined weight of both pieces is 70 grams. These fossils make great unusual gifts and each one is totally unique.
Around 200 million years old (Hettangian, Early Jurassic), this fossil would make a wonderful addition to any collection.