agate or cornelian, a variety of microcrystalline quartz (chalcedony) used in jewelry and ornaments

the Danube river

Nauru, island country in the southwestern Pacific

the Danube

Manaus (city in Brazil)

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

a variety of banded chalcedony, including onyx or white agate

sardonyx (gemstone of brown-white striped chalcedony)

chrysoprase (mineral)