The sulfate chlorides are double salts containing both sulfate (SO₄^2–) and

chloride The chloride ion is the anion (negatively charged ion) Cl−. It is formed when the element chlorine (a halogen) gains an electron or when a compound such as hydrogen chloride is dissolved in water or other polar solvents. Chloride salts ...

(Cl^–)

anion An ion () is an atom or molecule with a net electrical charge. The charge of an electron is considered to be negative by convention and this charge is equal and opposite to the charge of a proton, which is considered to be positive by convent ...

s. They are distinct from the

chlorosulfate Chlorosulfuric acid (IUPAC name: sulfurochloridic acid) is the inorganic compound with the formula HSO3Cl. It is also known as chlorosulfonic acid, being the sulfonic acid of chlorine. It is a distillable, colorless liquid which is hygroscopic and ...

s, which have a chlorine atom attached to the sulfur as the ClSO₃⁻ anion. Many minerals in this family exist. Many are found associated with

volcano A volcano is a rupture in the crust of a planetary-mass object, such as Earth, that allows hot lava, volcanic ash, and gases to escape from a magma chamber below the surface. On Earth, volcanoes are most often found where tectonic plates are ...

es and fumaroles. As minerals they are included in the Nickel-Strunz classification group 7.DG. The book ''Hey's Chemical Index of Minerals'' groups these in subgroup 12.2.

List

Artificial

Some "chloride sulfates" are sold as solutions in water and used for water treatment. these include ferric chloride sulfate and polyaluminium sulfate chloride. The solutions may also be called "chlorosulfates" even though they do not contain a chlorosulfate group.

References

{{Reflist Sulfates Chlorides Double salts Mixed anion compounds