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Answer for the clue "Mineral found in dried lake basins ", 4 letters:
urao

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Word definitions for urao in dictionaries

Wiktionary Word definitions in Wiktionary
n. (context mineralogy English) The mineral trona.

The Collaborative International Dictionary Word definitions in The Collaborative International Dictionary
Trona \Tro"na\, n. [Of Egyptian or North African origin.] (Chem. & Min.) A native double salt, consisting of a combination of neutral and acid sodium carbonate, Na2CO3.2HNaCO3.2H2O , occurring as a white crystalline fibrous deposit from certain soda brine ...