Beautiful Septarian Concretion from the Belgian area of Boom,

Mid-Oligoceen,30 million years old,

this oval-shaped stone forms inside sedimentary rock.

It’s composed primarily of the minerals calcite, aragonite and siderite.

the formation of a septarian nodule is a slow process that takes place over millions of years,

mint condition and beautiful shine of the stone,

41 cm high x 29 cm wide x 10 cm deep