Tiny drop-like isometric crystals of mayenite in Ca-rich matrix. Black co-existing mineral could be jasmundite or brownmillerite (or eventually magnesioferrite). Recent research (i.e. Boysen et al. 2007) shows, that the structure of the mineral, based on aluminate framework, with 'free oxygen' distributed within in, giving (at high temperatures) high ionic conductivity to the mineral. This explains the possible use of mayenite as inorganic electride.
Field of view is 1.9 mm and the specimen was obtained from Sonke Stolze mineral shop (thanks!).
Field of view is 1.9 mm and the specimen was obtained from Sonke Stolze mineral shop (thanks!).
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