Polished Echinoid Fossil 7.2cm not-on-sale Thick layers of Aragonite typically

Thick layers of Aragonite typically leads to shades of red being observed

9cm long displays a unique pattern of stunning rainbow colours

This very large

caramel-brown and cream

Sunstone has also been called 'aventurescent feldspar'

Polished Echinoid Fossil 7.2cm not-on-sale Thick layers of Aragonite typicallyThis 7. 2cm long echinoid fossil from Madagascar is a fossilised sea urchinpart of the class Echinoidea, a group of marine animals with hard calcite shells that preserve very well in sedimentary rock. What they are Echinoids are sea urchins and sand dollars that lived on ancient seabeds. Their fossils typically show a five petalled (star like) pattern from their tube foot system. Why Madagascar specimens are common Madagascar is a well known fossil