Zirconium(IV) silicate

Zirconium(IV) silicate
Names
	Preferred IUPAC name Zirconium(IV) silicate
	Systematic IUPAC name Zirconium(4+) silicate
	Other names Zircon; Zirconium(4+) orthosilicate; Zirconium(IV) orthosilicate
Identifiers
CAS Number	10101-52-7 ;
3D model (JSmol)	Interactive image;
ChemSpider	55663 ;
ECHA InfoCard	100.030.216
EC Number	233-252-7;
MeSH	Zircon
PubChem CID	61775;
UNII	4SY8H89134 ;
CompTox Dashboard (EPA)	DTXSID60892246 ;
	InChI InChI=1S/O4Si.Zr/c1-5(2,3)4;/q-4;+4 Key: GFQYVLUOOAAOGM-UHFFFAOYSA-N ;
	SMILES [Zr+4].[O-][Si]([O-])([O-])[O-];
Properties
Chemical formula	O4SiZr
Molar mass	183.305 g·mol−1
Appearance	Colourless crystals
Density	4.56 g cm−3
Melting point	1,540 °C (2,800 °F; 1,810 K) (decomposes)
Structure
Crystal structure	tetragonal
Thermochemistry
Heat capacity (C)	98.3 J/mol K
Std enthalpy of; formation (ΔfH⦵298)	−2044 kJ/mol
Hazards
NFPA 704 (fire diamond)	1 0 1
Flash point	Non-flammable
Safety data sheet (SDS)	MSDS
	Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa). verify (what is ?) Infobox references

Zirconium silicate, also zirconium orthosilicate, ZrSiO₄, is a chemical compound, a silicate of zirconium. It occurs in nature as zircon, a silicate mineral. Powdered zirconium silicate is also known as zircon flour.

Zirconium silicate is usually colorless, but impurities induce various colorations. It is insoluble in water, acids, alkali and aqua regia. Hardness is 7.5 on the Mohs scale.

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