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REFERENCE LINKING PLATFORM OF KOREA S&T JOURNALS
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Journal of the Mineralogical Society of Korea
Journal Basic Information
Journal DOI :
The Mineralogical Society of Korea
Editor in Chief :
Volume & Issues
Volume 20, Issue 4 - Dec 2007
Volume 20, Issue 3 - Sep 2007
Volume 20, Issue 2 - Jun 2007
Volume 20, Issue 1 - Mar 2007
Selecting the target year
Hydrothermal Synthesis of Kaolinite
Jang, Young-Nam ; Ryu, Gyoung-Won ; Chae, Soo-Chun ; Lee, Sung-Ki ; Suh, Yong-Jae ; Bae, In-Kook ;
Journal of the Mineralogical Society of Korea, volume 20, issue 3, 2007, Pages 147~153
] was successfully synthesized by a hydrothermal process from amorphous
under the pressure of
. The experiments were performed varying temperatures (
), pressure (
), chemistry (
) and pH (
) of the solution. The autoclaving was carried out in a closed stainless steel vessel. Kaolinite appears from the starting composition of
with boehmite and was stable as a single phase with the composition of
. Boehmite was a stable phase below
for the 240 h period of autoclaving, but kaolinite appeared even in 20 h at
. The single kaolinite phase of a good crystallinity was observed at pH ranging 2 to 6. That indicates that pH is one of the most critical parameters for the successful formation of kaolinite. The optimal molar ratio of
was determined to be 0.45. The XRD pattern of the synthesized kaolinite coincided with that of natural one and its morphology was the cluster type of the kaolinite crystals (diameter =
), irrespective of starting material, composition and temperature.
Synthesis of Organic Silicon Compounds from Siliceous Mudstone
Kim, Byoung-Gyu ; Jang, Hee-Dong ; Kim, Jong-Seok ;
Journal of the Mineralogical Society of Korea, volume 20, issue 3, 2007, Pages 155~163
A novel route to the synthesis of tetramethoxysilane and other silicon alkoxides is described using siliceous mudstone as the raw material. The reaction of amorphous silica with triethanol-amine is enhanced by using an alkali metal hydroxide catalyst to form a range of triethanol-amnine-substituted silatrane species. These can undergo alkoxide exchange in acidic alcohols to form alkoxysilatranes, tetraalkoxysilanes, hexaalkoxydisiloxanes and higher siloxanes. Products were identified by FT-IR spectroscopy, XRD, SEM, 1H and 13C NMR spectroscopy, or gas chromatography.
Characters of Fracture-filling Minerals in the KURT and Their Significance
Lee, Seung-Yeop ; Baik, Min-Hoon ;
Journal of the Mineralogical Society of Korea, volume 20, issue 3, 2007, Pages 165~173
The KAERI Underground Research Tunnel (KURT) located in KAERI (Korea Atomic Energy Research Institute) was recently constructed following the site investigation in 2003. Its dimension is 180 m in length, 6 m in width, and 6 m in height, and it has a horseshoe-like cross-sec-lion and is located in the ground to the depth of 90 m. When the tunnel was dug into the ground with 100 m in length, fresh rocks, weathered rocks and fracture-filling materials were taken and examined by mineralogical and chemical analyses. There are phyllosilicate minerals such as illite, smectite and chlorite including calcite, which are filling some faults and cracks of the KURT rock. The illite and smectite usually coexist in the fracture, where their content ratio is different according to which mineral is predominant. There are high concentrations of U and Th in the rocks coated with iron-oxides and filled with secondary materials as compared with those in the fresh rocks. It seems that the radionuclides, which are slowly leached from the parent rocks or exist as a dissolved form in the groundwater and hydrothermal solution, may have been migrated along the fractures and thereafter selectively sorbed and coprecipitated on the iron-oxides and the fracture-filling materials. These results will be very useful far the evaluation of environmental factors affecting the nuclides migration and retardation when long-term safety is considered to the geological disposal of high-level radioactive wastes in the future.
Application of FTIR on the study of Natural, Synthetic and Irradiated Diamonds
Kim, Jong-Rang ; Shon, Shoo-Hack ; Kim, Su-Hun ; Lim, Ye-Won ; Kim, Jong-Gun ; Kim, Jeong-Jin ; Jang, Yun-Deuk ;
Journal of the Mineralogical Society of Korea, volume 20, issue 3, 2007, Pages 175~180
FTIR technique was applied to delineate spectroscopic characteristics of natural, synthetic and irradiated diamonds. All of the samples studied in this work show the absorption peaks, which are generally observed in diamond as well as the specific one related to N in diamonds. Synthetic diamond is characterized with both the peaks of 1344 and
related to HPHT synthesis and specific
peak only observed in synthetic diamond, which can be used to discriminate natural from synthetic. Type (natural blue diamond: IIb, electron beam Irradiated blue diamond: Type Ia) can be used to discriminate natural from irradiated diamond. The intensity of specific
peak observed only in irradiated diamond is related with irradiation and annealing process.
Gemological Comparison between Gwangdong Tektite and Baikdusan Obsidian
Kim, Won-Sa ;
Journal of the Mineralogical Society of Korea, volume 20, issue 3, 2007, Pages 181~191
The gemological charateristics of Gwangdong tektites and Baikdusan obsidians were investigated, using microscopy, density and refractive index measurements, X-ray fluorescence spectrometry, Inductively Coupled Plasma Mass spectrometry, X-ray powder diffraction, and electron microprobe analysis. The Gwangdong tektites and Baikdusan obsidians are both black in colour and slightly trans-lucent with various shades of brown when cut into a few mm thick. Both the materials yield conchoidal fracture on broken surface. The tektites occur as tear-drop shapes, ranging from 4 to 10 cm long, and in spheres, from 3 to 5 cm in diameter. On the surface numerous shallow pits up to 3 mm in diameter are present. Mohs' hardness and specific gravity are 5 to 5.5 and 2.66, respectively. The tektites are singly refractive, with an refractive index of 1.51. Numerous spherical air bubbles are randomly scattered throughout the tektites, and silica-rich glass inclusions are occasionally seen. X-ray powder diffraction analysis verifies that they are non-crystalline. The Baikdusan obsidians show very similar properties to those of the Gwangdong tektites, especially in hardness, amorphous nature and fracture. Nevertheless, the Baikdusan obsidian can readily be distinguished from the Gwangdong tektites by refractive index (
), specific gravity (2.67 to 2.68), and inclusions (absence of bubbles and presence of sanidine and magnetite crystals).
Local Environments of Li in the Interlayer of Clay Minerals at Room and High Temperatures
Kim, Yeong-Kyoo ; Lee, Ji-Eun ;
Journal of the Mineralogical Society of Korea, volume 20, issue 3, 2007, Pages 193~201
MAS NMR to investigate the fate and local environments of Li in the interlayer of clay minerals such as hectorite, Woming-montmorillonite, beidellite, and lepidollite at room and high (
) temperature. Although
NMR spectra show narrower peaks than those of
NMR, S/N ratio is low and there are no obvious differences in chemical shifts suggesting that it is difficult to apply
NMR to have information on the local environments of Li in the clay interlayers.
NMR spectra, however, show changes in the peak width and quadrupole patterns providing information on the local environments of Li in the interlayer even though changes in the chemical shift are not observed. In montmorillonite, two different local environments of Li are observed; one has a narrow peak with typical quadrupole patterns whereas another has a broad peak without those of the patterns. Changes in the peak width is also observed from broad to narrow in the
NMR spectra for beidellite but not for hectorite at high temperature. Our results suggest that the peak width change in the broad peak is attributed to the coordination changes in the water molecules around Li which is tightly bonded on the basal oxygen of Si tetrahedra as inner-sphere complexes. The narrow peak in montmorillnoite can be assigned to the Li bended as outer-sphere complexes.
Quantitative X-ray Diffraction Analysis of the Yellow Sea Surface Sediments; 2nd Yellow Sea Cruise Samples in 2001
Moon, Dong-Hyuk ; Kim, Soon-Oh ; Yi, Hi-Il ; Shin, Dong-Hyeok ; Shin, Kyung-Hoon ; Cho, Hyen-Goo ;
Journal of the Mineralogical Society of Korea, volume 20, issue 3, 2007, Pages 203~212
Mineral compositions of 89 Yellow Sea surface sediments collected at the second cruise in 2001, were determined using the high resolution X-ray diffractometer and Siroquant v.3.0 program. Yellow Sea surface sediments are composed of major minerals (quartz 57.8%, plagioclase 16.0% and alkali feldspar 10.0%), clay minerals, and calcite. Illite (8.7%) is the most abundant clay mineral, chlorite (2.6%) is the second, and kaolinite (0.6%) is few. however smectite is not detected. Quartz content is very high around the margin of the Yellow Sea, however is very low along the northwest to southeast direction extending from southeast of Sandong Peninsula to southwest of Jeju Island. It has similar distribution pattern with that of coarse sediment (sand). The coarse sediment, is mainly consisted of quartz, may be much supplied from the eastern part and southwestern part of the Yellow Sea. Illite distribution pattern is opposite to that of quartz. It is similar to those of clay and mud particles, therefore it can be suggested that fine sediment may be largely supplied from the northwestern part of the Yellow Sea. It is necessary to continue this kind of investigation, because it is difficult to interpret the sediment provenance of the Yellow Sea only from the result of this study.
Studies on Variations of Turbidity with Strength of Rainfall and Mineralogy of turbidity-causing materials in Imha and Andon-Dam
Kim, Jeong-Jin ; Jung, Yong-Sik ; Kim, Jung-Gon ; Lee, Sang-Wook ; Kim, Young-Hun ;
Journal of the Mineralogical Society of Korea, volume 20, issue 3, 2007, Pages 213~222
Changes of turbidity and suspended solid concentration of inflow tend to be very similar in Andong and Imha dam, and show significant effect on the amount of rainfall. Concentrations of suspended solid and turbidity in Imha are higher than these of Andogn dam, and Banbyon have higher values than that of Yongjeon stream in Imha dam. There is no difference in size distribution and mineral composition of the suspended particles in Andong and Imha dam. The turbidity-causing materials are composed of vermiculite. illite, kaolinite, quartz and albite. X-ray diffraction analysis shows that turbidity-causing materials are have similar mineralogy between Andong and Imha Dam, but they have different abundance.
Hydrothermal Mechanism of Na-A Type Zeolite from Natural Siliceous Mudstone
Bae, In-Kook ; Jang, Young-Nam ; Chae, Soo-Chun ; Kim, Byoung-Gon ; Ryu, Kyoung-Won ; Lee, Sung-Ki ;
Journal of the Mineralogical Society of Korea, volume 20, issue 3, 2007, Pages 223~229
The mechanism of hydrothermally synthesizing Na-A zeolite from siliceous mudstone at a
ratio of 0.6, a
2.0 and a
119 has been observed by IR, DTA, XRD and SEM. This mudstone is a tertiary periodic sedimentary rock and widely spreads around the Pohang area. In the early hydrothermal synthesis at
in an autoclave, sodium silicate and sodium aluminate were found to be preferentially reacted to generate Na-A type zeolite. Gibbsite and bayerite were also formed due to the presence of extra aluminum oxide in the feedstock. As reaction time in-creased up to 50 h, residual sodium aluminatewas reacted with siliceous mudstone, causing the Na-A zeolite crystal to grow and the hydroxylsodalite to generate. Therefore, in the
synthetic time, Na-A zeolite and hydroxylsodalite were formed. Also, if reaction time passed over 50 h, a part of the Na-A zeolite was finally redissolved and reacted with hydroxylsodalite to synthesize Na-P zeolite, generating porous surface of Na-A zeolite and disappearing hydroxylsodalite.