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.

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] This inorganic compound–related article is a stub.