The double salts crystallized from the quinary system “Na-K-Mg-Cl-SO
4-H
2O” are nine, namely astrakanite, carnallite, glaserite, kainite, langbeinite, leonite, loeweit, schoenite and vanthoffite. Few papers have been reported about the powder X-ray diffraction research of these oceanic double salts and even the A.S.T.M. data file list only 3 of these, i. e. astrakanite, glaserite and langbeinite. In this paper, these 9 double salts are synthetized artificially, and microphoto-graphed and finally the powder X-ray diffraction data are taken by the Geiger counter X-ray diffractometer, using Cu Kα radiation. As the results of this research, it was found that
(1) On astrakanite, the strongest line of d=3.25 Å listed in A.S.T.M. data file was separated into 2 peaks, i. e. d=3.25 Å anp d=3.24 Å, and consequently the strongest line proceeded to d=4.53Å. Moreover, several small peaks which are not listed in A.S.T.M. were observed.
(2) On glaserite, the largest d spacing was not 4.07 Å (d
101) [A.S.T.M.] but 4.87 Å (d
100), and the lattice constant were determined (hexagonal, a=5.64Å, c=7.33Å and c/a=1.298). The intensity ratio of A.S.T.M. data were corrected.
(3) On langbeinite, the observed data were in good agreement with the A.S.T.M. data. Each diffracted lines were indexed.
(4) On the other 6 residual double satle, d spacing and intensity ratios of diffracted lines were. determined.
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