| Sulphate-rich waters in bitter lakes produce mirabilite which alters on exposure to thenardite both along the margins of the lake and in its deeper parts. |
| Among natural resources mirabilite, sodium sulphate, is of great importance, mined in the gulf of Kara Bogaz Gol. |
| It is obtained either from deposits of the sodium sulfate minerals mirabilite and thenardite or synthetically by the treatment of sodium chloride with sulfuric acid. |
