agate; cornelian; a hard mineral with various colored bands often used for ornaments or industrial bearings

The second longest river in Europe, flowing through central and eastern Europe into the Black Sea.

Nauru, an island country in the southwestern Pacific Ocean

(bound form) the Danube River

The capital city of the state of Amazonas in northwestern Brazil

cowrie; any of various sea snails of the family Cypraeidae with glossy, patterned shells

(bird species of China) Naung Mung scimitar babbler; Napothera naungmungensis

agate; cornelian

red chalcedony often used as a semi-precious gemstone; cornelian

chrysoprase; a green variety of chalcedony

onyx; white agate

a gemstone characterized by brown and white striped chalcedony