Tschernichite, a new mineral that occurs with boggsite near Goble, Oregon, has a disordered structure of the Beta type.Tschernichite,' is a new mineral that is associated with several other zeolites including boggsite2J in hydrothermally altered basalt near Goble, Columbia County, Oregon. Its chemical

does not alter the asymptotic edge, 15 there is a shift to lower photon energies of the apparent continuum absorption coupled with the disappearance of all exciton peaks at S>{. Published GaAs absorption data 16 have been taken at temperatures which are too high to observe these effects. Preliminary data at liquid-nitrogen temperature 17 confirm the prediction of the shift in the continuum absorption in GaAs. A description of the experiments 18 in Cu 2 0 requires the selection of m -1 in Eqs. (4). Our numerical calculations have not yet been extended to include this case.

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