noun see: chalk Date: circa 1858 the nitrate-bearing gravel or rock of the sodium nitrate deposits of Chile and Peru, a crust of calcium carbonate that forms on the stony soil of arid regions
CALICHE
Meaning of CALICHE in English
Merriam Webster. Explanatory English dictionary Merriam Webster. Толковый словарь английского языка Мерриам-Уэбстер. 2012