The minerals of the colemanite deposits at Lang have been described by Prof. Eakle,1 as comprising colemanite, bowlite and calcite. During the summer of 1916 the writer visited the locality and had his attention called to the ulexite. The association of ulexite and colemanite seems never to have been noted before and because of the light it may shed upon the origin of the colemanite, a short description seems desirable. Unfortunately the significance of the association of the two minerals was not realized at the time of the visit, and little study of their exact relations was made.

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