Many different forms of calcium aluminosilicate are known, the most common of which are CaAl2Si2O8 and Ca2Al2SiO7. It occurs in nature as the minerals: anorthite, bavenite, clinozoisite, didymolite, epistilbite, gehlenite, gismondite, grossularite, heulandite, hibschite, laubanite, laumontite, lawsonite, levynite, margarite, meionite, plazolite, pumpellyite, scolecite, stellerite, vesuvianite, zoisite. Prepn and properties: Gmelins, Aluminum (8th ed.) 35B, 576-586 (1934). Summary and references for minerals: Hey, An Index of Mineral Species and Varieties (British Museum, London, 2nd ed., 1962) pp 159-162.