Sodium magnesium sulfate is a

double A double is a look-alike or doppelgänger; one person or being that resembles another. Double, The Double or Dubble may also refer to: Film and television * Double (filmmaking), someone who substitutes for the credited actor of a character * Th ...

sulfate of

sodium Sodium is a chemical element with the symbol Na (from Latin ''natrium'') and atomic number 11. It is a soft, silvery-white, highly reactive metal. Sodium is an alkali metal, being in group 1 of the periodic table. Its only stable iso ...

and

magnesium Magnesium is a chemical element with the symbol Mg and atomic number 12. It is a shiny gray metal having a low density, low melting point and high chemical reactivity. Like the other alkaline earth metals (group 2 of the periodic ta ...

. There are a number of different stoichiometries and degrees of hydration with different crystal structures, and many are minerals. Members include: *

Blödite Blödite or bloedite is a hydrated sodium magnesium sulfate mineral with formula: Na2Mg(SO4)2·4H2O. The mineral is clear to yellow in color often darkened by inclusions and forms monoclinic crystals. Blödite was first described in 1821 for an ...

or bloedite: sodium magnesium sulfate tetrahydrate Na₂Mg(SO₄)₂•4H₂O *Disodium magnesium disulfate decahydrate Na₂Mg(SO₄)₂•10H₂O *Disodium magnesium disulfate hexadecahydrate Na₂Mg(SO₄)₂•16H₂O * Konyaite Na₂Mg(SO₄)₂•5H₂O * Löweite Na₁₂Mg₇(SO₄)₁₃•15H₂O. * Vanthoffite Na₆Mg(SO₄)₄ *Na₂Mg₂(SO₄)₃ langbeinite form stable from 569.2 to 624.7°C *Na₂Mg₂(SO₄)₃ quenched

monoclinic In crystallography, the monoclinic crystal system is one of the seven crystal systems. A crystal system is described by three vectors. In the monoclinic system, the crystal is described by vectors of unequal lengths, as in the orthorhombic s ...

form *Na₂Mg₃(SO₄)₄ orthorhombic form *Na₂Mg(SO₄)₂ triclinic form Salts containing other

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 in addition to sulfate *Na₂Mg₃(OH)₂(SO₄)₄•4H₂O * Tychite hexasodium dimagnesium sulfate tetracarbonate Na₆Mg₂SO₄(CO₃)₄ *

Uklonskovite Uklonskovite ( Na Mg( S O4) F) is a colorless monoclinic mineral found in Chile, Italy and Uzbekistan Uzbekistan (, ; uz, Ozbekiston, italic=yes / , ; russian: Узбекистан), officially the Republic of Uzbekistan ( uz, Ozbekiston Res ...

NaMgSO₄F•2H₂O

References

External links

* {{Use dmy dates, date=October 2017 Sulfates Magnesium compounds Sodium compounds Double salts