REMARKABLE IRONSTONE CONCRETION WITH FOSSIL 'HEART COCKLES'
« backIt is an ironstone concretion, or septarian nodule, which has been cut in half and the surface polished, revealing the calcite shells of bivalves in section, together with calcite-filled fissures. There are also some patches of pyrite.
These extinct bivalves are related to the modern ‘heart cockle’ which is roughly heart-shaped, which gives them their common name.
This specimen is truly unique and a real geological curiosity.
Presented in a lidded gift box. There are some minor scratches on the polished surface (see photos).
Size: approx. 16 x 11 x 2.5 centimetres
Weight: 734 grams