Carlosruizite is a sulfate – iodate 6(Na 4)12(I 2O. It has a low density (specific gravity of 3.36), colorless to pale yellow, transparent mineral which crystallizes in the trigonal crystal system It forms a series with fuenzalidaite.
It was first discovered in 1994 in the locality of Zapiga, Tarapacá Region. Its name came from Carlos Ruiz Fuller (1916–1997), founder of the Institute of Geological Investigations
It is found in samples of iquiqueite leached from caliche amarillo (yellow nitrate ore).