Strontium sulfate

Strontium sulfate

Names
IUPAC name Strontium sulfate
Other names Celestine
Identifiers
CAS Number	7759-02-6 Y
3D model (Jmol)	Interactive image
ChemSpider	2341151 Y
ECHA InfoCard	100.028.955
EC Number	231-850-2
PubChem CID	3084026
UNII	7Q3KX2L47F N
InChI InChI=1S/H2O4S.Sr/c1-5(2,3)4;/h(H2,1,2,3,4);/q;+2/p-2 Y Key: UBXAKNTVXQMEAG-UHFFFAOYSA-L Y InChI=1/H2O4S.Sr/c1-5(2,3)4;/h(H2,1,2,3,4);/q;+2/p-2 Key: UBXAKNTVXQMEAG-NUQVWONBAV
SMILES [Sr+2].[O-]S([O-])(=O)=O
Properties
Chemical formula	SrSO4
Molar mass	183.68 g/mol
Appearance	white orthorhombic crystals
Density	3.96 g/cm3
Melting point	1,606 °C (2,923 °F; 1,879 K)
Solubility in water	0.0135 g/100 mL (25 °C) 0.014 g/100 mL (30 °C)
Solubility product (Ksp)	3.44 x 10−7
Solubility	insoluble in ethanol, alkalis slightly soluble in acids
Magnetic susceptibility (χ)	−57.9·10−6 cm3/mol
Refractive index (nD)	1.622
Structure
Crystal structure	Orthorhombic, oP24
Space group	Pnma, No. 62
Thermochemistry
Std molar entropy (So298)	117.0 J·mol−1·K−1
Std enthalpy of formation (ΔfHo298)	-1453.1 kJ·mol−1
Hazards
Safety data sheet	External MSDS data
NFPA 704	0 1 0
Flash point	Non-flammable
Related compounds
Other anions	Strontium chloride Strontium oxide
Other cations	Beryllium sulfate Magnesium sulfate Calcium sulfate Barium sulfate
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
N  (what is YN ?)
Infobox references

Strontium sulfate (SrSO₄) is the sulfate salt of strontium. It is a white crystalline powder and occurs in nature as the mineral celestine. It is poorly soluble in water to the extent of 1 part in 8,800. It is more soluble in dilute HCl and nitric acid and appreciably soluble in alkali chloride solutions (e.g. sodium chloride).

Strontium sulfate is a polymeric material, isostructural with barium sulfate. Crystallized strontium sulfate is utilized by a small group of radiolarian protozoa, called the Acantharea, as a main constituent of their skeleton.

Strontium sulfate is of interest as a naturally occurring precursor to other strontium compounds, which are more useful. In industry it is converted to the carbonate for use as ceramic precursor and the nitrate for use in pyrotechnics.