One of the mysteries of the English language finally explained.
A gray mineral which occurs as an evaporite in salt deposits and consists of a hydrated carbonate and bicarbonate of sodium.
- ‘In addition to its well-preserved fossil fish, the Green River Formation is famous for its trona and oil shale.’
- ‘In alkaline lakes, natron and trona are found in the United States, Africa, and South America.’
- ‘Most of the sodium carbonate used in North America comes from large deposits of the mineral trona, a sodium carbonate/bicarbonate found in Wyoming.’
- ‘Another large producer of soda ash, the Corporation, also relies on trona to manufacture soda ash and sodium bicarbonate.’
- ‘There is a zone nearly half of which consists of granular aggregates of trona and natron with numerous inclusions of pale pink prismatic crystals of shomiokite- reaching 15 cm long and 8 cm in diameter.’
Late 18th century: from Swedish, from Arabic naṭrūn (see natron).
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