Definition of caliche in English:
1A mineral deposit of gravel, sand, and nitrates, found especially in dry areas of South America.
- The urgent trade shifted surprisingly to Chilean deserts nearby, where deposits of caliche, a crude mineral conglomerate of salts, including nitrates, had been laid down during the late Tertiary and Quaternary eras.
- The Rexroad Formation of Pliocene age is composed of silts, sands, consolidated gravels and numerous caliche zones, and overlies the Miocene Ogallala Formation in the Borchers Badlands.
- Thus, the suite of sulfates found in the oxide zone of the Chuquicamata copper deposit and the nitrates and iodates found in the caliche deposits of northern Chile owe their existence to the extreme aridness of the great Atacama Desert.
mid 19th century: from Latin American Spanish.