About two years ago attention was called to the rapid rise in commercial importance of andalusite, as a result of the discovery of a large deposit of it in California.1 One might assume that the development of a mineral of such great value from the ceramic standpoint, accompanied as it was by an almost revolutionary change in the composition of certain types of porcelains, would justify a pause in the search for better material. However, as a result of the fact that modern research is continually striving for the better, we are able at this time to add another hitherto rare and practically useless mineral to the list of those of real value. The mineral referred to is dumortierite. As in the case of the California andalusite, the present deposit of dumortierite is owned and has been developed by the Champion Porcelain Company of

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