In the previous paper (Part I), the ‘self-absorption factor, τ1, ’ and the ‘extra absorption coefficient, Δμ’ were derived and introduced to the formula of reflected X-ray intensity. In this paper, the coefficient Δμ is proved to be non-negative in a mixed powder of multiple components and to be zero in a powder of single component. The relation of magnitudes betweenΔμ/μ and μD is estimated on the assumption of μ>(μi ?? μj). Discussion is made on the magnitude of particle size D to make the particle effects on reflected X-ray intensity negligible.
The main end members of the sodalite group, that is, chlorine sodalite, bromine sodalite, iodine sodalite, hydroxylsodalite, carbonate noselite, sulfate noselite, chromate noselite, molybdate noselite and tungstate noselite, were synthesized under hydrothermal and dry conditions, and the cell edges ao and cell volumes V of these minerals were determined. These minerals can be divided into two subgroups: the sodalite subgroup, which includes chlorine sodalite, bromine sodalite, iodine sodalite and hydroxylsodalite, and the noselite subgroup, which includes carbonate noselite, sulfate noselite, chromate noselite, molybdate noselite and tungstate noselite. The X-ray powder diffraction patterns of the four end members of the sodalite subgroup make their appearance only as h+k+l=2n. Those of five other end members which belong to the noselite subgroup appear as h+k+l=2n and h+k+l=2n+1. The dissociation temperatures of chlorine sodalite and sulfate noselite are 1230°±5°C in chlorine sodalite and 1255°±5°C in sulfate noselite, and complete solid solution was found to exist between chlorine sodalite (Na8Al6Si6O24Cl2) and sulfate noselite (Na8Al6Si6O24SO4) at temperatures above 1050°C. Compositions of the chlorine sodalite-sulfate noselite solid solutions were determined from the cell edges ao, obtained by measuring the shifts of the 211, 310 and 222 reflections (CuKα). A solvus of the chlorine sodalite-sulfate noselite series was determined at temperatures below 1050°C. Polymorphic relationship was discovered in the sulfate noselite in the noselite subgroup.
The first roquesite in Japan found in a magnetite-bearing massive chalcopyrite ore from the subvolcanic ore deposits of the Akenobe mine, Hyogo prefecture was determined by electron microprobe analysis giving Cu, 24.9; Fe, 1.8; Mn, 0.2; Zn, 0.1; In, 46.3; S, 25.7; total, 99.0%, and was studied under the ore microscope. Mineral assemblage with this specimen was found to be different from that of the original French roquesite, which may be due to the special condition of its formation, or possibly a lower Eh condition. Occurrence of some indium minerals in Japanese subvolcanic ore deposits suggests the presence of an ‘indium ore province’.