“…Several sulfate ion peaks present in the Owens Lake Crust sample were associated with sodium (e.g., 119 NaSO 4 − , 165 Na 3 SO 4 + ), likely due to the presence of thenardite (Na 2 SO 4 ) and mirabilite (Na 2 SO 4 • 10H 2 O), which are present when the surface of Owens (dry) Lake is covered with an erodible, efflorescent evaporite salt crust. 32,33,51,62,63 Notably, the Owens Lake Dust sample contained 23 Na + , 27 Al + , and silicate peaks ( 60 SiO 2 − , 76 SiO 3 − , etc.) consistent with previous results that indicated that this sample contained a mixture of surface salts and the underlying aluminosilicate material.…”