A cut & polished ammonite from Madagascar. This one has warm brown calcite showing its chambers. The specimen is discreetly and permanently attached to a gold coloured stand.
Ammonites are extinct relatives of modern day nautiloids and squid. The largest known ammonite in the world would have been 8 1/2 feet (2.59 metres) across if it were complete.
7/8 inch (2.2 cm) wide, 5/16 inch (0.8 cm) deep and 7/8 inch (2.2 cm) tall.