scholarly journals Gemological and mineralogical-petrographic study of the Eastern Sayan serpentinites

2021 ◽  
Vol 44 (1) ◽  
pp. 48-55
Author(s):  
A. A. Anisimova
Keyword(s):  
Iron Oxides ◽  
Microscopic Examination ◽  
Research Laboratory ◽  
Thin Sections ◽  
Bluish Green ◽  
Ore Minerals ◽  
Eastern Sayan ◽  
The Moment ◽  
Dark Green ◽  
Petrographic Study

The purpose of the research is to study the mineralogical and petrographic characteristics of the Eastern Sayan serpentinites in order to identify their most decorative varieties. The objects of the study are the samples of serpentinites from the Ulan-Khodinskoye and Khokhurtovskoye deposits of the Eastern Sayan. Six samples were studied macroscopically then polished plates were made from them for gemological examination and thin sections for microscopic examination. All studies were carried out using standard gemological methods at the Gemmology Research Laboratory of the Irkutsk National Research Technical University. The petrographic study of thin sections was carried out using an Axio Lab A1 microscope. Macroscopically, two main ornamental varieties of serpentinite were identified: spotted bluish-green serpentinite and massive serpentinite of the color from dark green to black. The spotted structure of serpentinite is determined by numerous inclusions of ore minerals including magnetite and iron oxides. Its hardness is 4.5 on the Moh’s scale, its gloss is matte. The data on the main gemological characteristics of the samples corresponding to the results of already published studies of gem-quality serpentinites from other deposits were also obtained. Having analyzed the microstructure and mineral composition of the Eastern Sayan serpentinites, their correspondence to the spotty and massive decorative varieties of serpentinites from other Russian deposits was revealed. At the moment, this material is not duly appreciated, although it may well be used as a sculptural and jewelry-ornamental decorative stone.

scholarly journals VI.—Notes on the Witwatersrand Beds, Transvaal

1903 ◽  
Vol 10 (12) ◽  
pp. 543-547 ◽  
Author(s):  
Frederick H. Hatch
Keyword(s):  
Microscopic Examination ◽  
Gold Deposits ◽  
Igneous Intrusion ◽  
Thin Sections ◽  
Igneous Origin

In discussing a paper by Mr. J. S. Curtis on the Witwatersrand Gold Deposits, Mr. George Denny has raised the point that the slates or shales of the Witwatersrand, which especially characterise, but are not confined to, the Lower Witwatersrand Beds (Hospital Hill Series), are not of sedimentary, but of igneous origin. He relies chiefly on the fact that he has observed in places that a so-called band of slate cuts across the bedding of the quartzites. I think we are all prepared to agree with him that, where he can point out that this occurs, the rock which traverses the bedded formation must be an igneous intrusion; but such cases are rare. In the vast majority of sections where the slates are exposed, they are found to occur truly bedded, and in conformable relation with the quartzites with which they are associated. It seems to me that, after all, this is in the main a petrological question, which can be easily settled by the examination of the rocks in question under the microscope.With this end in view I have examined a number of thin sections of these rocks, in all cases prepared from the cores of boreholes, on account of the difficulty of obtaining near the surface specimens sufficiently fresh and unweathered for microscopic examination; and I have selected geological horizons which are well known on the Witwatersrand. They are (1) the band of slates which occurs in the neighbourhood of the Bird Reef Series, and (2) the slates which occur in the footwall of the Main Reef itself, in both cases in the eastern portion of the Witwatersrand, as at Van Ryn and Geduld.

scholarly journals Green Synthesis and Characterization of Copper Nanoparticles Using Fortunella margarita Leaves

Polymers ◽  
2021 ◽  
Vol 13 (24) ◽  
pp. 4364
Author(s):  
Rutaba Amjad ◽  
Bismillah Mubeen ◽  
Syed Shahbaz Ali ◽  
Syed Sarim Imam ◽  
Sultan Alshehri ◽  
...  
Keyword(s):  
Copper Nanoparticles ◽  
Color Change ◽  
Metal Oxide Nanoparticles ◽  
Visual Observation ◽  
X Ray Diffraction ◽  
Synthesis Of Nanoparticles ◽  
Characteristic Absorption Peak ◽  
Bluish Green ◽  
Dark Green

The use of biomaterials in the synthesis of nanoparticles is one of the most up-to-date focuses in modern nanotechnologies and nanosciences. More and more research on green methods of producing metal oxide nanoparticles (NP) is taking place, with the goal to overcome the possible dangers of toxic chemicals for a safe and innocuous environment. In this study, we synthesized copper nanoparticles (CuNPs) using Fortunella margarita leaves’ extract, which reflects its novelty in the field of nanosciences. The visual observation of a color change from dark green to bluish green clearly shows the instant and spontaneous formation of CuNPs when the phytochemicals of F. margarita come in contact with Cu+2 ions. The synthesis of CuNPs was carried out at different conditions, including pH, temperature, concentration ratio and time, and were characterized with UV-Vis absorption spectra, scanning electron microscope (SEM) and X-ray diffraction (XRD). The UV-Vis analysis reveals the surface plasmon resonance property (SPR) of CuNPs, showing a characteristic absorption peak at 679 nm, while SEM reveals the spherical but agglomerated shape of CuNPs of the size within the range of 51.26–56.66 nm.

scholarly journals Petrographic Study of Sedimentary Iron Ore in Shendi -Atbara Basin, River Nile State, Sudan.

2021 ◽  
Vol 3 (1) ◽  
Author(s):  
Abubaker A. M. A. Abasher ◽  
Sadam H.M.A. Eltayib ◽  
El Sheikh M. Abdelrahman ◽  
Mohammed M.A. Amlas
Keyword(s):  
Chemical Weathering ◽  
Iron Ore ◽  
Field Work ◽  
Chemical Precipitation ◽  
Office Work ◽  
River Nile ◽  
Stratigraphic Sequence ◽  
Thin Sections ◽  
Geological Conditions ◽  
Petrographic Study

This paper presents the results of petrographic study of sedimentary iron ore from surface strata of the Shendi -Atbara Basin, River Nile State, Sudan. The aims of this study are to investigate the geological behavior and geological conditions affecting precipitation of sedimentary iron ore. The methodologies have been used to realize the objectives of this study included; field work, office work and labrotary work include thin sections and polished sections analysis. According to field observation sedimentary iron ore can broadly be considered as occurring in three major classes: Ferribands iron, ferricrete iron and oolitic iron ores. The modes of occurrence of iron ore was described at the outcrops and vertical sedimentary profiles revealed that the iron occurred in study area at different types in stratigraphic sequence such as cap, beded and interbeded conformable with Shendi Formation. Petrographic study of iron ore in collected samples using polarized microscope and ore microscope includes study of the textures and structures of ores to obtain ore history. The main types of textures and structures in studied samples are oolitic, granular, lamellar and bands. According to these results the origin of iron ore is formed by chemical precipitation during chemical weathering of surrounding areas in continental lacustrine environment. The iron ore in study area is potential for future mining works and steals industry.

THE BEES OF ALBERTA—IV

1937 ◽  
Vol 69 (5) ◽  
pp. 113-114 ◽  
Author(s):  
T. D. A. Cockerell
Keyword(s):  
White Hair ◽  
Bluish Green ◽  
Basal Half ◽  
Dark Green ◽  
Olive Green

Female. Length about 7 mm., anterior wing 6.5 ; robust, without much hair, the abdomen bare and shining, without hair bands, but the mesopleura with rather abundant greyish-white hair; head and thorax dark green, the thorax posteriorly and at its sides almost black; mandibles black, faintly reddish apically; margin of clypeus black; face shining green; mesothorax dark, more bluish green, dull in front, shining posteriorly; scutellum steel-blue, postscutellum black, but metathorax, seen from above, olive green; legs and abdomen black; antennae black; tegulae dark brown, with minute punctures, only seen under microscope; clypeus flattened in middle, with several longitudinal grooves; front dull; vertex shining blue; mesothorax without distinct sculpture as seen under a lens, but with minute rather sparse punctures on a minutely lineolate surface; scutellum strongly bigibbous, the elevations shining; area of metathorax large, dull, with a shining margin, plications strong on basal half; posterior truncation sharply bounded; wings conspicuously reddish, stigma and nervures dull red ; second cubital cell large, receiving recurrent nervure near end; hair on inner side of hind tarsi pale reddish; hind spur with four very long oblique spines, and a fifth rudimentary one; abdomen without evident punctures, as seen under lens, the microscope shows excessively minute scattered ones.

A TECHNIQUE FOR SELECTIVE SOLUTION OF IRON OXIDES IN THIN SECTIONS OF SOIL

1975 ◽  
Vol 26 (3) ◽  
pp. 247-249 ◽  
Author(s):  
P. BULLOCK ◽  
P. J. LOVELAND ◽  
C. P. MURPHY
Keyword(s):  
Iron Oxides ◽  
Thin Sections

New Ore Minerals from the Kingash Ultramafic Massif, Northwestern Eastern Sayan

2017 ◽  
Vol 59 (7) ◽  
pp. 626-631 ◽  
Author(s):  
A. N. Yurichev ◽  
A. I. Chernyshov
Keyword(s):  
Ultramafic Massif ◽  
Ore Minerals ◽  
Eastern Sayan

scholarly journals ORE MINERALOGY AND MINERAL CHEMISTRY OF PYRITE, GALENA, AND SPHALERITE AT SORIPESA PROSPECT AREA, SUMBAWA ISLAND, INDONESIA

2015 ◽  
Vol 4 (1) ◽  
Author(s):  
Win Kant ◽  
I Wayan Warmada ◽  
Arifudin Idrus ◽  
Lucas Donny Setijadji ◽  
Koichiro Watanabe
Keyword(s):  
Low Temperature ◽  
Hydrothermal Fluid ◽  
Mineral Chemistry ◽  
Careful Study ◽  
Average Content ◽  
Thin Sections ◽  
Content Ratio ◽  
Fe Content ◽  
Ore Minerals ◽  
Ore Mineralogy

The Soripesa prospect area is located at Maria village, Wawo district, Bima region in the East Sumbawa Island, Indonesia. Lithology is dominantly composed of a lithic-crystal tuff of andesitic and dacitic composition and bedded limestone. The polymetallic epithermal quartz veins are hosted by andesitic volcaniclastic rocks. Within these veins, multiphases, colloform-crustiform, bedding to massive textures with pyrite, sphalerite, galena, chalcopyrite, chalcocite, azurite, and malachite are observed. Selected samples were analyzed by using ore microscopy and SEM-EDX. Ore minerals show replacement, ex-solution, colloform, and zonal textures. The paragenesis diagram was made from a careful study of polished sections and thin sections. Textures of ore minerals such as banded, exsolution, replacement, and zone, have been interpreted to correspond to the order of deposition. In pyrite, the average content of Co (0.45 wt.%) is higher than Ni content (0.14 wt.%) and it means that their origin may be hydrothermal origin. Average content ratio, Co:Ni is 2.81. Galena shows a low Ag content of 0.07 %in average. But they show a high Au content of 1.48 %in average. Sphalerite shows a low Fe content of 1.04 %in average and occasionally chalcopyrite inclusion/disease also occurred. Ga and Ge contents are also high in sphalerite. Co>Ni in pyrite, low content of Ag in Galena, low content of Fe and mole % FeS in sphalerite, high content of Ga and Ge, and log (Ga/Ge) in sphalerite, show that pyrite, galena, and sphalerite from Soripesa prospect area were formed under low temperature condition of hydrothermal fluid. Keywords: Ore textures, paragenesis, deposition, hydrothermal fluid, low temperature

Balneaves: Soil Thin Sections

1992 ◽  
Vol 58 (S2) ◽  
pp. 23-25
Author(s):  
Donald Davidson
Keyword(s):  
Iron Oxides ◽  
Fine Fraction ◽  
Coarse Fraction ◽  
Random Pattern ◽  
Medium Sand ◽  
Thin Sections ◽  
Amorphous Iron ◽  
Channel Pattern ◽  
Mineral Components ◽  
Quartz Grains

1. Structure: partially accommodated channels (0.16 to 0.80mm in width) above the pan; no aggregates; fewer channels below the pan; channel pattern - straight to curved; vughs (spherical to elongate, not normally connected) 0.4 to 0.8mm in diameter and are not orientated and have random pattern: above pan channels and vughs partially connected; pellicular grain microstructure - weakly developed.2. Mineral components: coarse fraction: quartz grains range in size from silt to fine/medium sand (<lmm). One large quartz (200mm). Dominance of single and compound quartz grains; instances of biotite and plagioclase; quartz grains -angular/subangular and smooth. Fine fraction: brown, optically amorphous iron oxides, isotropic.

Niccolite-magnetite mineralization from Upper Teesdale, North Pennines

1985 ◽  
Vol 49 (353) ◽  
pp. 555-559 ◽  
Author(s):  
B. Young ◽  
M. T. Styles ◽  
N. G. Berridge
Keyword(s):  
Electron Microprobe ◽  
Fault System ◽  
The North ◽  
Field Evidence ◽  
Ore Minerals ◽  
Petrographic Study

AbstractNiccolite and other nickel-bearing minerals have been found in magnetite-rich ore at Lady's Rake Mine [NY 8063 3414] in the North Pennines 5.5 km NW of Langdon Beck, Teesdale, Co. Durham. Associated ore minerals include galena, sphalerite, chalcopyrite, pyrite, and pyrrhotite. Similar magnetite-rich ores, in places bearing ugrandite garnets, have been located at two nearby localities, though without nickel minerals. Petrographic study indicates that this unusual assemblage developed in a skarn environment, probably related to the intrusion of the Whin Sill. Field evidence suggests an association with the Teesdale Fault system. Electron microprobe analyses show that Lady's Rake niccolite is near to end-member composition: analyses of other North Pennine niccolites show up to 25 at. % substitution of S and Sb for As.

Electron microscopic evidence for a double hair-like nap appearing at low frequency on Bacillus anthracis Sterne spores

1969 ◽  
Vol 15 (10) ◽  
pp. 1247-1248 ◽  
Author(s):  
M. J. Kramer ◽  
Ivan L. Roth
Keyword(s):  
Bacillus Anthracis ◽  
Microscopic Examination ◽  
Low Frequency ◽  
Electron Microscopic Examination ◽  
Uranyl Acetate ◽  
Spore Coat ◽  
Lead Citrate ◽  
Electron Microscopic ◽  
Thin Sections ◽  
Very Low Frequency

Electron microscopic examination of thin sections of Bacillus anthracis Sterne spores triply poststained with KMnO4, uranyl acetate, and lead citrate has indicated an unusual morphological variant. These spores are seen at very low frequency and have, in addition to the hair-like nap normally associated with the exosporium a second hairy layer which appears to originate in the spore coat complex.

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