Chlormayenite (after
Mayen,
Germany), Ca
12Al
14O
32 ˜4Cl2 is a rare calcium aluminium
oxide mineral
The oxide mineral class includes those minerals in which the oxide anion (O2−) is bonded to one or more metal alloys. The hydroxide-bearing minerals are typically included in the oxide class. The minerals with complex anion groups such as the si ...
of
cubic symmetry.
It was originally reported from
Eifel
The Eifel (; lb, Äifel, ) is a low mountain range in western Germany and eastern Belgium. It occupies parts of southwestern North Rhine-Westphalia, northwestern Rhineland-Palatinate and the southern area of the German-speaking Community of ...
volcanic complex (Germany) in 1964. It is also found at
pyrometamorphic sites such as in the
Hatrurim Formation of
Israel and in some burned coal dumps.
[
It occurs in thermally altered limestone xenoliths within basalts in Mayen, Germany and Klöch, ]Styria
Styria (german: Steiermark ; Serbo-Croatian and sl, ; hu, Stájerország) is a state (''Bundesland'') in the southeast of Austria. With an area of , Styria is the second largest state of Austria, after Lower Austria. Styria is bordered to ...
, Austria. In the Hatrurim of Israel it occurs in thermally altered limestones. It occurs with calcite
Calcite is a Carbonate minerals, carbonate mineral and the most stable Polymorphism (materials science), polymorph of calcium carbonate (CaCO3). It is a very common mineral, particularly as a component of limestone. Calcite defines hardness 3 on ...
, ettringite, wollastonite, larnite, brownmillerite, gehlenite, diopside, pyrrhotite, grossular, spinel
Spinel () is the magnesium/aluminium member of the larger spinel group of minerals. It has the formula in the cubic crystal system. Its name comes from the Latin word , which means ''spine'' in reference to its pointed crystals.
Properties
S ...
, afwillite, jennite, portlandite, jasmundite, melilite, kalsilite and corundum
Corundum is a crystalline form of aluminium oxide () typically containing traces of iron, titanium, vanadium and chromium. It is a rock-forming mineral. It is a naturally transparent material, but can have different colors depending on the pres ...
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.][Boysen H., Kaiser-Bischoff I. and Lerch M. (2007) Anion ]Diffusion Processes
Molecular diffusion, often simply called diffusion, is the thermal motion of all (liquid or gas) particles at temperatures above absolute zero. The rate of this movement is a function of temperature, viscosity of the fluid and the size (mass) of ...
in O- and N-Mayenite Investigated by Neutron Powder Diffraction. Bunsen Colloquium: Diffusion and Reactions in Advanced Materials (September 27th–28th, Clausthal-Zellerfeld
Clausthal-Zellerfeld is a town in Lower Saxony, Germany. It is located in the southwestern part of the Harz mountains. Its population is approximately 15,000. The City is the location of the Clausthal University of Technology. The health resort ...
, Germany) / The Open-Access Journal for the Basic Principles of Diffusion Theory, Experiment and Application.
Chlormayenite is also found as calcium aluminate
Calcium is a chemical element with the symbol Ca and atomic number 20. As an alkaline earth metal, calcium is a reactive metal that forms a dark oxide-nitride layer when exposed to air. Its physical and chemical properties are most similar to ...
in cement where its formula is also written as 11CaO·7 Al2O3·CaCl2, or C11A7CaCl2 in the cement chemist notation.
See also
* Calcium aluminate cements
References
Oxide minerals
Calcium minerals
Aluminium minerals
Cubic minerals
Minerals in space group 220
Cement
Concrete
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