抄録
The 7 double salts crystallized from th sexinary system “Na-K-Mg-Ca-Cl-SO4-H2O”, namely glauberite, krugite (its existence doubtful), pentacalciumsulfate, polyhalite, syngenite, 2 Na2SO4·CaSO4·2 H2O and Na2SO4·5 CaSO4·3 H2O, are studied by the same manner as the previous paper. The A.S.T.M. data file lists 4 of these, i.e., glauberite, pentacalciumsulfate, polyhalite and syngenite. The conclusions of this paper are as follows:(1) On glauberite,(a) the larg estd spacing was not 6.22Å (A.S.T.M.) but 7.56Å.(b) the strongest line of d=3.13Å(A.S.T.M.) was separated into 2 peaks, d=3.16Å and d=3.11Å, consequently,(c) the strongest line proceeded to d=3.93Å, therefore,(d) the intensity ratios were corrected for all lines.(2) On krugite, in spite of tests by J. H. van't Hoff's or A. Geiger's synthetic method, it was unable to synthetized artificially. The deposited salts were confirmed as anhydrite by both chemical analysis and powder X-ray diffraction.(3) On pentacalciumsulfate and polyhalite, there was some difference between observed d value and the A.S.T.M. value.(4) On syngenite, the A.S.T.M. data was considered to be entirely mistaken.(5) On the other 2 residual double salts, d spacings and intensity retios of all diffracted lines were determined.
