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Chlormayenite
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Chlormayenite, Ca₁₂Al₁₄O₃₂[☐₄Cl₂], is a rare calcium aluminium oxide mineral of cubic symmetry.
It was originally reported from Eifel volcanic complex in 1964. It is also found at pyrometamorphic sites such as in the Hatrurim Formation of Israel... Wikipedia
Crystal class: Hextetrahedral (43m); H-M symbol: (4 3m)
Crystal habit: Microscopic anhedral grains
Crystal system: Cubic
Formula (repeating unit): Ca12Al14O32