Calcium aluminosilicate

Identifiers
CAS Number	37342-39-5
3D model (JSmol)	Interactive image
ChemSpider	32698750
ECHA InfoCard	100.048.597
EC Number	253-476-9
E number	E556 (acidity regulators, ...)
PubChem CID	56843091
UNII	98139KV0X6
InChI InChI=1S/2Al.Ca.2O4Si/c;;;2*1-5(2,3)4/q2*+3;+2;2*-4 Key: GWWPLLOVYSCJIO-UHFFFAOYSA-N
SMILES [O-] [Si]([O-])([O-])[O-].[O-] [Si]([O-])([O-])[O-].[Al+3].[Al+3].[Ca+2]
Properties
Chemical formula	CaAl2Si2O8
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa). Infobox references

Calcium aluminosilicate, an aluminosilicate compound with calcium cations, most typically has formula CaAl₂Si₂O₈.^[1] In minerals, as a feldspar, it can be found as anorthite, an end-member of the plagioclase series.

Uses

As a food additive, it is sometimes designated E556. It is known to the FDA as, at under 2% by weight, an anti-caking agent for table salt, and as an ingredient in vanilla powder.^[1]