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Mayenite (after Mayen, Germany), Ca12Al14O33, is a rare cubic mineral of cubic symmetry, originally reported from Eifel volcanic complex (Germany). It is also found at pyrometamorphic sites: e.g., in the Hatrurim Formation (Israel) and in some burned coal dumps. The formula can be written as [Ca12Al14O32]O , which refers to the unique feature: anion diffusion process. Mayenite is also found as calcium aluminate in cement where its formula is also written as 12 CaO · 7 Al2O3 , or C12A7 in the cement chemist notation.
1. ^ Sokol E.V., Maksimova N.V., Nigmatulina E.N., Sharygin V.V. and Kalugin V.M. (2005) Combustion metamorphism. Novosibirsk: Publishing House of the SB RAS. — Handbook of Mineralogy. — Mindat