Bismuth crystals ammonete With its distinctive zig-zag shell

With its distinctive zig-zag shell edge

The Calamite was a medium sized tree

Lightly polished

minimum size of the trilobite is  6cm x 3cm

Bismuth crystals ammonete With its distinctive zig-zag shellBismuth is a semi metal element used in all manner of industrial and pharmaceutical products. This bismuth has been found in its non crystallised, grey silver form, heated until molten and then cooled to naturally allow the bismuth to form into its characteristic cubic crystals. The iridescent rainbow colour is a result of oxidisation as the stair step crystals cool. These mind blowing crystals are made in the UK. Length: 5cm Height 5cm Depth 5cm