Calcium aluminosilicate
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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.
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.