1. Appleman, D.E., Nissen, H.U., Stewart, D.B., Clark, J.R., Dowty, E., Huebner, J.S.: Studies of lunar plagioclase, tridymite and cristobalite. Proc. 2nd Lunar Sci. Conference, Vol. 1, pp. 117–133. Cambridge, Mass.: The MIT Press 1971
2. Barth, T.F.W.: Feldspars. New York-London: Wiley-Interscience 1964
3. Bruno, E., Fachinelli, A.: Experimental studies on anorthite crystallization along the join CaAl2Si2O8-SiO2. Bull. Soc. Franc. Minéral. Crist. 97, 422–432 (1974)
4. Davis, G.L., Tuttle, O.F.: Two new crystalline phases of the anorthite composition, CaO Al2O-O3·SiO2. Am. J. Sci., Bowen Vol. 107–114 (1951)
5. Donnay, G.: Hexagonal CaAl2Si2O8. Acta Cryst. 5, 153 (1952)