초록

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Abstract ▼ AI-Helper

The natural (Ca, Mg)-buserite has been identified from the manganese oxideores of the Janggun mine, Korea, which have been formed by supergene weathering of sedimentary-metamorphic rhodochrosite. It occurs together with rancieite forming one very fine-grained buserite-rancieite flake. This (Ca, Mg)-...

The natural (Ca, Mg)-buserite has been identified from the manganese oxideores of the Janggun mine, Korea, which have been formed by supergene weathering of sedimentary-metamorphic rhodochrosite. It occurs together with rancieite forming one very fine-grained buserite-rancieite flake. This (Ca, Mg)-buserite-rancieite occurs as microcystalline flaky crystals. It precipitated around the fine-grained takanelite aggregate. Electron microprobe analyses give the formula ($Ca_{.08}Mg_{.07}Mn_{.05}^{2+})Mn_{.89}^{4+}O_2{\cdot}1.46H_2O$ for (Ca, Mg)-buserite. The dehydration experiments by relative humidity control and heating as well as rehydration experiment by relative humidity control show that (Ca, Mg)-buserite dehydrates completely at 90$^{\circ}C$ and rehydrates up to 27% of the original state. The dehydration at 26% RH (corresponding to heating to about 40$^{\circ}C$) is characterized by thedecrease in the decrease in the intensity of 9.86${\AA}$ peak with slight shifting to 9.60${\AA}$. It is due to the loss of weakly bound water molecules in the interlayer. The dehydration from 40$^{\circ}C$ to 90$^{\circ}C$ is characterized by the gradual shifting of 001 peak from 9.6${\AA}$ to 7.42${\AA}$. It is due to the loss of weakly bound water molecules in the interlayer.