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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.[1] The formula can be written as [Ca12Al14O32]O [2], which refers to the unique feature: anion diffusion process.[3] 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
2. ^ Palacios L., Cabeza A., Bruque S., García-Granda S. and Aranda M.A.G. (2008) Structure and Electrons in Mayenite Electrides. Inorganic Chemistry, 47(7), pp. 2661–2667.
3. ^ Boysen H., Kaiser-Bischoff I. and Lerch M. (2007) Anion Diffusion Processes in O- and N-Mayenite Investigated by Neutron Powder Diffraction. Bunsen Colloquium: Diffusion and Reactions in Advanced Materials (September 27th–28th, Clausthal-Zellerfeld, Germany) / The Open-Access Journal for the Basic Principles of Diffusion Theory, Experiment and Application.

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