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SummaryFurther data are presented on the properties of natural and synthetic members of this series. Cell constants have been determined for over 50 specimens across the composition range; the activation energy for a low-high transformation in an intermediate hyalophane has been evaluated as 101·5 ± 5·0 kcal/mole; additional single crystal studies have revealed complexities not previously reported.Although there remain many detailed problems to be resolved, the present studies allow somedoi:10.1180/minmag.1968.283.036.02 fatcat:qspejfmtkvclbb3xvf5nupyvjy