Calcium chromate

Calcium Chromate
	Anhydrous calcium chromate
	Calcium chromate pigment
Names
	IUPAC name Calcium chromate
	Other names Calcium chromate (VI); Calcium monochromate; Calcium Chrome Yellow; C. I. Pigment Yellow 33; Gelbin; Yellow Ultramarine
Identifiers
CAS Number	13765-19-0 ;
3D model (JSmol)	Interactive image;
ChemSpider	24471 ;
ECHA InfoCard	100.033.955
EC Number	237-66-8;
PubChem CID	26264;
RTECS number	GB2750000;
UNII	J1FGH4ZJ4M ;
CompTox Dashboard (EPA)	DTXSID0024717 ;
	InChI InChI=1S/Ca.Cr.4O/q+2;;;;2-1 Key: RFAFBXGYHBOUMV-UHFFFAOYSA-N ; InChI=1/Ca.Cr.4O/q+2;;;;2-1/rCa.CrO4/c;2-1(3,4)5/q+2;-2 Key: RFAFBXGYHBOUMV-DETYUTSMAY;
	SMILES [Ca+2].[O-][Cr]([O-])(=O)=O;
Properties
Chemical formula	CaCrO4
Molar mass	156.072 g/mol
Appearance	bright yellow powder
Density	3.12 g/cm3
Melting point	2,710 °C (4,910 °F; 2,980 K)
Solubility in water	anhydrous 4.5 g/100 mL (0 °C) ; 2.25 g/100 mL (20 °C) ; dihydrate 16.3 g/100mL (20 °C) ; 18.2 g/100mL (40 °C)
Solubility	soluble in acid ; practically insoluble in alcohol
Structure
Crystal structure	monoclinic
Related compounds
Other anions	Calcium dichromate
Other cations	Beryllium chromate; Magnesium chromate; Strontium chromate; Barium chromate; Radium chromate
Hazards
	Occupational safety and health (OHS/OSH):
Main hazards	highly toxic, carcinogen, mutagen
NFPA 704 (fire diamond)	3 0 1 OX
	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

Calcium chromate is an inorganic compound with the formula CaCrO₄, i.e. the chromate salt of calcium. It is a bright yellow solid which is normally found in the dihydrate form CaCrO₄·2H₂O. A very rare anhydrous mineral form exists in nature, which is known as chromatite.

The compound is occasionally used as a pigment, but this usage is limited due to the very toxic and carcinogenic nature of hexavalent chromium compounds such as chromate salts.