Article · Wikipedia archive · Last revised Jun 29, 2026

Calcium aluminosilicate

Calcium aluminosilicate is an aluminosilicate compound containing calcium cations, most commonly with the chemical formula CaAl2Si2O8. In minerals, as a feldspar, it can be found as anorthite, an end-member of the plagioclase series.

Last revised
Jun 29, 2026
Read time
≈ 1 min
Length
140 w
Citations
2
Source
Wikipedia ↗
Calcium aluminosilicate
Identifiers
3D model (JSmol)
ChemSpider
ECHA InfoCard 100.048.597
EC Number
  • 253-476-9
E number E556 (acidity regulators, ...)
UNII
  • InChI=1S/2Al.Ca.2O4Si/c;;;2*1-5(2,3)4/q2*+3;+2;2*-4
    Key: GWWPLLOVYSCJIO-UHFFFAOYSA-N
  • [O-][Si]([O-])([O-])[O-].[O-][Si]([O-])([O-])[O-].[Al+3].[Al+3].[Ca+2]
Properties
CaAl2Si2O8
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).

Calcium aluminosilicate is an aluminosilicate compound containing calcium cations, most commonly with the chemical 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. The FDA recognizes it as an anti-caking agent for table salt when used at levels below 2% by weight, and as an ingredient in vanilla powder.1

References

References