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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
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Volume & Issues
Volume 21, Issue 4 - Dec 2008
Volume 21, Issue 3 - Sep 2008
Volume 21, Issue 2 - Jun 2008
Volume 21, Issue 1 - Mar 2008
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Mineralogical Changes Caused by the Weathering of Tailings Deposited on the Riverside of the Nakdong River, Bonghwa, Korea
Kim, Min-Jung ; Kim, Yeong-Kyoo ; Park, Hyoung-Sim ; Jeon, Sang-Ho ;
Journal of the Mineralogical Society of Korea, volume 21, issue 4, 2008, Pages 331~339
In the upstream of Nakdong river in Bonghwa-gun, Gyeongsangbuk-do, certain areas of riverside were found to be covered by weathered mine tailings which were assumed to be migrated and deposited by flood. This study was conducted to investigate the formation and characteristics of the secondary minerals from tailings and related leaching behavior of heavy metals in the severely weathered tailing deposits by river waters. Quartz, feldspar, micas, chlorite, hornblende, talc, pyroxene (johannsenite), pyrite, and calcite were identified as primary minerals by XRD. Kaolinite can be formed by the weathering of tailings, but considering the short period of weathering time, kaolinite in the deposits is considered to be from unweathered tailings or moved from soils. The secondary minerals such as goethite, gypsum, basanite, and jarosite were also identified. The formation of the secondary minerals was affected by the species of primary minerals and pH conditions. The weathering of pyrite produced sulfate minerals such as gypsum, basanite, jarosite, and also goethite. Mn oxide was also identified by SEM, coated on the primary minerals such as quartz. This Mn oxide was poorly crystalline and thought to be the weathering product of johannsenite (Mn-pyroxene). The Fe and Mn oxides are the main minerals determining the brown/red and black colors of weathered tailings. EDS results showed that those oxides contain high concentrations of Pb, Zn, and As, indicating that, in the river, the formation of Fe and Mn oxides can control the behavior and leaching of heavy metals by co-precipitation or adsorption.
Scaling up Hydrothermal Synthesis of Na-A Type Zeolite from Natural Siliceous Mudstone and Its Heavy Metal Adsorption Behavior
Bae, In-Kook ; Jang, Young-Nam ; Shin, Hee-Young ; Chae, Soo-Chun ; Ryu, Kyoung-Won ;
Journal of the Mineralogical Society of Korea, volume 21, issue 4, 2008, Pages 341~347
The feasibility of commercializing the hydrothermal synthesis of Na-A type zeolite from siliceous mudstone has been conducted using a 50-liter bench-scale autoclave and the application of the zeolite as an environmental remediation agent. Siliceous mudstone, which is widely distributed around the Pohang area, was adopted as a precursor. The siliceous mudstone is favorable for the synthesis of zeolite because it contains 70.7%
, which are major ingredient of zeolite formation. The synthesis of zeolite was carried out under the following conditions that had been obtained from the previous laboratory-scale tests: 10hr reaction time,
ratio = 0.6,
ratio = 2.0 and
ratio= 98.6. The crystallinity and morphology of the zeolite formed were similar to those obtained from the laboratory-scale tests. The recovery and cation exchange ion capacity were 95% and 215 cmol/kg, respectively, which are slightly higher than those obtained in laboratory scale tests. To examine the feasibility of the zeolite as an environmental remediation agent, experiments for heavy metal adsorption to zeolite were conducted. Its removal efficiencies of heavy metals in simulated waste solutions decreased in the following sequences: Pb > Cd > Cu = Zn > Mn. In a solution of 1500 mg/L total impurity metals, the removal efficiencies for these impurity metals were near completion (> 99%) except for Mn whose efficiency was 98%. Therefore, the synthetic Na-A type zeolite was proven to be a strong absorbent effective for removing heavy metals.
Distribution of Clay Minerals in Soils on the Northern Drainage Basin of the Nakdong River
Lee, Bong-Ho ; Jeong, Gi-Young ;
Journal of the Mineralogical Society of Korea, volume 21, issue 4, 2008, Pages 349~354
Semiquantitative mineralogical analysis of clays in soils was performed to understand the distribution of clay minerals in relation to bedrock lithology on the northern basin of the Nakdong River. The soils developed on the granitic bedrocks have high contents of kaolinite and smectite. mite was the major clay mineral in the soils from sedimentary bedrocks, with minor kaolinite, smectite, and intergrade (interstratified chlorite-smectite or hydroxy-interlayed vermiculite) clay minerals. Illite and kaolinite contents of the soils from metamorphic and volcanic bedrocks fall between those of the soils from the granitic bedrocks and those of the soils from the sedimentary bedrocks. The clay mineralogy of the soils depends on the compositions of bedrock minerals and their susceptibility to chemical weathering. The weathering of plagioclase resulted in the high kaolinite content of the soils derived from granitic bedrocks, while the soils derived from sedimentary bedrocks are abundant in residual illite.
Application of FTIR on the Study of Spectroscopic Characteristics on Emerald from Itabira, Brazile
Lim, Ye-Won ; Jang, Yun-Deuk ; Kim, Jong-Rang ; Kim, Hyeong-Soo ; Kim, Jong-Gun ; Kim, Jeong-Jin ;
Journal of the Mineralogical Society of Korea, volume 21, issue 4, 2008, Pages 355~364
Emerald deposit located on Itabira, Brazil is one of the major one in the world. We applied three different analytical approaches on Itabira emerald samples, (1) perpendicular to the c-axis, (2) parallel to the c-axis, (3) emerald pallet mixed with KBr, using Fourier Transform Infrared (FTIR) spectroscopy, to understand and compare spectroscopic characteristics of three Itabira emerald samples. Occurrence of
absorption peaks within
-related range indicates that the samples belong to Type-II emerald. These emerald samples also display strong absorption peak generated from Type-IIa emerald preserving
- and Cl-related absorption peaks observed within specific range except for
-related range. These observations and results suggest that FTIR analysis can be used for not on1y classification of emerald types, but also prediction of
content within the emerald through comparison of relative peak intensity.
Mineralogical Characteristics of Stellerite associated with the Yucheon Granite, Cheongdo, Korea
Choo, Chang-Oh ; Lee, Jin-Kook ; Cho, Hyen-Goo ;
Journal of the Mineralogical Society of Korea, volume 21, issue 4, 2008, Pages 365~372
Because stellerite, belonging to the zeolite group, is much less common mineral than any other minerals in Korea, little mineralogical study has been done so far. Stellerite occurs on open surfaces of fractured zones in the Yucheon Granite associated with flowery tourmaline, Chongdo, Gyeongsangbuk-do. Stellerite with
width is characterized by an equigranular and euhedral form. Flat and elongated columnar crystals show well developed (010) face. Stellerite shows an intensive alteration process, possibly due to weathering or devitrification, as evidenced by microtextural analysis of Scanning Electron Microscope (SEM). Water loss occurs at
while dehydroxylation occurs at
causing decomposition of the structure afterward. From its textural observation, it is concluded that stellerite formed rapidly at small undercooling, precipitated from residual melt during the late stage with relatively constant chemistry.
Geochemical Characteristics of Mineral Phases in the Mantle Xenoliths from Sunheul-ri, Jeju Island
Kil, Young-Woo ; Shin, Hong-Ja ; Yun, Sung-Hyo ; Koh, Jeong-Seon ; Ahn, Ung-San ;
Journal of the Mineralogical Society of Korea, volume 21, issue 4, 2008, Pages 373~382
First reported geochemical characteristics of mantle xneoliths (spinel peridotites) from Sunheul-ri, Jeju Island, provide important clues for understanding the lithosphere composition, equilibrium temperature, and the period of entrainment and transport of the xenoliths in the host magma. Core and rim of mineral phases in the xenoliths are constant chemical compositions as
of olivines. The ranges of equilibrium temperature, obtained by two pyroxenes geothermometer, are about
for Sunheul-ri spinel peridotite xenoliths and are similar to the range of equilibrium temperatures for the xenoliths from other sites in Jeju island. The period of entrainment and transport of the xenoliths in the host magma of Sunheul-ri mantle xenoliths is about 42 days.
Gravity Separation Characteristic for the Gold.Silver Ores on the Philippine Mankayan District
Kim, Hyung-Seok ; Chae, Soo-Chun ; Kim, Jeong-Yun ; Sohn, Jeong-Soo ; Kim, Sang-Bae ;
Journal of the Mineralogical Society of Korea, volume 21, issue 4, 2008, Pages 383~395
To enhance the grade and recovery rate of the gold/silver ores which yield at Philippine Mankayan mine, we studied the characteristics which are the geologic and mineralogical features of gold and silver ore, the liberation by crushing and grinding, the separation by sieving and shaking table. Gold/silver ore is composed of the sulfide minerals like pyrite, sphalerite, galena; and the gangue minerals which is quartz, clay. Gold/silver element are mainly contained in a sulfide minerals like pyrite, sphalerite and galena. To increase the liberation rate of sulfide minerals containing gold/silver element, the gold/silver ore has to be grounded under
very finely because the crystal size of sulfide minerals is distributed from
. The liberation rate of gold/silver ore increases to 92% when the particle size (
) of ore is grounded below
by jaw crusher
rod mill by steps. The grade and recovery of sulfide minerals could not be enhanced by sieving separation because those crystal size is distributed homogeneously below
. But, when we separated the sieved ore using shaking table, the gold and silver grade increased to 40 ppm and 140 ppm, respectively. Then the recovery rate of gold reach almost 100% but that of silver is no more that 50%.
Mineralization and Characterization of Boseung Kaolin in Gaya Area
Noh, Jin-Hwan ;
Journal of the Mineralogical Society of Korea, volume 21, issue 4, 2008, Pages 397~413
In Gaya area, the Boseong kaolin deposits exhibit locally unusual occurrences such as downward enrichment of kaoin minerals, characteristic hydrothermal alterations (illite and stilbite), and phase relations among kaolin minerals in addition to the extensive weathering of anorthositic country rocks. This indicates that the kaolin deposits seem to be genetically formed as a mixed hydrothermal and residual model. The kaolin ores can be divided into five types on the basis of differences in occurrence, mineral composition and characters. These consist of two types of high-grade ores ranging above 80% in grade and low-grade ores as low as less than 80% including feldspar residuals or the peculiar impurity phase of illite-vermiculite-stilbite. Halloysite and kaolinite are mostly coexisted in the Boseong kaolin, and these kaolin minerals exhibit diverse appearances in crystallinity and morphology. Such a diversity in mineral phase and crystallinity seems to be originated from the complexity in genesis. In addition to these diverse characters of the kaolin, its applied-mineralogical characteristics such as chemical composition, thermal properties, whiteness, viscosity, and etc. made it disadvantageous in terms of ore quality.
A Study of the Oxyhydroxide Presence at the Earth Core
Kim, Young-Ho ; Do, Jae-Ki ; Hwang, Gil-Chan ;
Journal of the Mineralogical Society of Korea, volume 21, issue 4, 2008, Pages 415~423
Earth outer core is composed of iron mainly with some diluent elements, which account for the observed ca. 10% density deficit compared to the pure iron. Among candidates as the light diluents, hydrogen and oxygen were selected, and the thermodynamic stability of the following reaction was calculated; hematite + hydrogen
goethite + iron. At ambient conditions, Gibb's free energy of this reaction is 12.62 kJ/mol. On increasing pressure at room temperature, it decreases to zero at 0.068 GPa. This energy decreases at constant rate down to 200 GPa, which shows -208.26 kJ/mol at that pressure. From these results, this chemical reaction prefers the reduction environment forming the iron element and iron oxyhydroxide, so possible presence of iron oxyhydroxide with iron at proto-core can not be ruled out.
Study on Adsorption Characteristics of Arsenic on Magnetite
Jeong, Hyeon-Su ; Lee, Woo-Chun ; Cho, Hyen-Goo ; Kim, Soon-Oh ;
Journal of the Mineralogical Society of Korea, volume 21, issue 4, 2008, Pages 425~434
Arsenic contamination in soil and groundwater has recently been one of the most serious environmental concerns. This arsenic contamination can be originated from natural or anthropogenic sources. It has been well known that arsenic behavior in geo-environmental is controlled by various oxides or hydroxides, such as those of iron, manganese, and aluminum, and clay minerals. Among those, particularly, iron (oxy)hydroxides are the most effective scavengers for arsenic. For this reason, this study characterized arsenic adsorption of magnetite which is a kind of iron oxide in nature. The physicochemcial features of the magnetite were investigated to evaluate adsorption of arsenite [As(III)] and arsenate [As(V)] onto magnetite. In addition to experiments on adsorption equilibria, kinetic experiments were also conducted. The point of zero charge (PZC) and specific surface area of the laboratory-synthesized magnetite used as an arsenic adsorbent were measured 6.56 and
, which values seem to be relatively smaller than those of the other iron (oxy)hydroxides. From the results of equilibria experiments, arsenite was much more adsorbed onto magnetite than arsenate, indicating the affinity of arsenite on magnetite is larger than arsenate. Arsenite and arsenate showed adsorption maxima at pHs 7 and 2, respectively. In particular, adsorption of arsenate decreased with increase in pH as a result of electrical repulsion caused by anionic arsenate and negatively-charged surface of magnetite. These results indicate that the surface charge of magnetite and the chemical speciation of arsenic should be considered as the most crucial factors in controlling arsenic. The results of kinetic experiments show that arsenate was adsorbed more quickly than arsenite and adsorption of arsenic was investigated to be mostly completed within the duration of 4 hours, regardless of chemical speciation of arsenic. When the results of kinetic experiments were fitted to a variety of kinetic models proposed so far, power function and elovich model were evaluated to be the most suitable ones which can simulate adsorption kinetics of two kinds of arsenic species onto magnetite.
A Study on the Characteristics of Natural, Synthetic, and Treated Gem Quality Diamonds by NMR and EPR
Kim, Jong-Rang ; Jang, Yun-Deuk ; Kim, Sun-Ha ; Kim, Jong-Hwa ; Paik, Youn-Kee ;
Journal of the Mineralogical Society of Korea, volume 21, issue 4, 2008, Pages 435~442
Natural, synthetic, and treated diamonds were studied by NMR and EPR. It was demonstrated that natural and synthetic diamonds, treated and non-treated diamonds, high pressure high temperature (HPHT) treated and electron beam treated diamonds could be distinguished among each other based on the
NMR spectra acquired for relatively short periods of 100 minutes. The
NMR linewidths of gem quality synthetic diamonds were broader than 1.6 ppm due to the paramagentic effects of transition metals, generally used as catalysts, while the linewidths of gem quality natural diamonds were narrower than 0.5 ppm regardless of the methods of treatment. The linewidth (0.5 ppm) for a HPHT treated, gem quality natural diamond was as broad as more than twice of the linewidth (0.2 ppm) of an electron beam treated diamond. The
NMR signal intensities of treated, gem quality natural diamonds were as strong as more than 10 times of the intensities of non-treated, gem quality natural diamonds. When correlated with the concentrations of the paramagnetic defects (electrons) obtained from the EPR spectra, the relative
NMR signal intensities increased in proportion to the concentrations of the paramagnetic electrons contained in each sample but the electron beam treated diamond was an exception. This suggested that the lattice component, in addition to the paramagnetic defect component, should also be considered in determining the
NMR signal intensity of the electron beam treated diamond.
Research Trends of Utilization of Halloysite as a Prospective Ingredient of Cosmeceuticals
Suh, Yong-Jae ; Jang, Young-Nam ; Kil, Dae-Sup ; Chung, Kang-Sup ; Lee, Su-Jeong ;
Journal of the Mineralogical Society of Korea, volume 21, issue 4, 2008, Pages 443~450