Calcium aluminosilicate

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Calcium aluminosilicate, an aluminosilicate compound with calcium cations, most typically has formula CaAl2Si2O8.[1]


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]

In minerals, as a feldspar, it can be found as anorthite, an end-member of the plagioclase series.


  1. ^ a b "Compound Summary for CID 21881395 - Calcium Aluminosilicate". PubChem.