Tags: Chemical Substance, Mineral.
Mayenite (after Mayen Germany) Ca12Al14O33 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 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 Austria. In the Hatrurim of Israel it occurs in thermally altered limestones.