Product Code Database
Chlormayenite (after Mayen, Germany), Ca12Al14O32☐4Cl2, is a rare calcium aluminium oxide mineral of cubic symmetry.
It was originally reported from Eifel volcanic complex (Germany) in 1964. It is also found at Pyrometamorphism sites such as in the Hatrurim Formation of Israel and in some burned coal dumps.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.
It occurs in thermally altered limestone within in Mayen, Germany and Klöch, Styria, Austria. In the Hatrurim of Israel it occurs in thermally altered limestones. It occurs with calcite, ettringite, wollastonite, larnite, brownmillerite, gehlenite, diopside, pyrrhotite, grossular, spinel, afwillite, jennite, portlandite, jasmundite, melilite, kalsilite and corundum in the limestone xenoliths. In the Hatrurim it occurs with spurrite, larnite, grossite and brownmillerite.
Synthetic Ca12Al14O33 and Ca12Al14O32(OH)2 are known, they are stabilized by moisture instead of chlorine. The formula can be written as Ca12Al14O32O, which refers to the unique feature: anion diffusion process.Boysen H., Kaiser-Bischoff I. and Lerch M. (2007) Anion Diffusion 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.
Chlormayenite is also found as calcium aluminate in cement where its formula is also written as 11CaO·7 Al2O3·CaCl2, or C11A7CaCl2 in the cement chemist notation.
See also
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