This once rare mineral is now found at an ever increasing number of localities, which are tabulated, with references to their description, and to the mineral in general, in the University of Nevada Bulletin, Vol. XXII, No. 2, issued March 15th, 1928, entitled “On the Mineral Dumortierite,” to which the reader is referred. This valuable paper also describes in detail the only mined deposit of commercial value, near Oreana, Nevada, the output of which is used, together with andalusite, in the manufacture of spark plugs, and many hundreds of tons are shipped yearly to Detroit for that purpose.

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