galaxite


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galaxite

[′gā·lak‚sīt]
(mineralogy)
MnAl2O4 A black mineral of the spinel series composed of an oxide of manganese and aluminum.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.
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When manganese oxide is in the presence of a +90% alumina refractory, it behaves similarly to iron oxide, forming a spinel compound, MnO*[Al.sub.2][O.sub.3] (galaxite), according to the following reaction:
MnO + [Al.sub.2][O.sub.3] [approaches] MnO*[Al.sub.2][O.sub.3] galaxite
In spinel-forming refractories that are alumina-enriched, it is possible to form either hercynite or galaxite [ILLUSTRATION FOR FIGURE 3 OMITTED].