Crossword Genius

Soluble mineral salt that occurs in arid soils and some natural waters (6)

Ross

I believe the answer is:

alkali

(Other definitions for alkali that I've seen before include "Antacid" , "Compound turning litmus blue" , "Basic stuff" , "Acid neutraliser" , "In pH terms, not acid" .)

I've seen this clue in The Mirror.
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