In the first instalment of this article11 the minerals showing absorption spectra consisting of narrow bands were discussed. There remain to be considered those in which the bands are mostly broader, at least as seen with the microspectroscope; these wrill be grouped according to color. For particularly broad bands the wave-lengths of both margins and center will be given, and as before, positions of brilliant transmission will be indicated by parallel lines. When data obtained by other workers with larger spectroscopes are cited, only the lines of significance in the present connection will be tabulated.

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