Goniatite

About it

Small, tightly coiled Paleozoic ammonoids whose sutures zigzag in a simple pattern of pointed lobes and rounded saddles. Polished Devonian ones from Morocco are common in shops.

Type

Fossil (mollusc)

Group

Cephalopod (mollusc)

Colours

grey, black, brown, gold

Transparency

opaque

Periods

Devonian, Carboniferous, Permian

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