Cleoniceras

About it

Smooth, flattened Early Cretaceous ammonite, often sold sliced in half and polished to show its calcite-filled chambers. Most come from near Mahajanga, Madagascar, some with pearly original shell.

Type

Fossil (mollusc)

Group

Cephalopod (mollusc)

Colours

brown, tan, cream, orange, iridescent

Transparency

opaque

Periods

Cretaceous

Typical values: real specimens vary. For more, see mindat.org.