Biotite in spatially-associated biotite-graphite schist contains high concentrations of Cu (up to 400 ppm), U (6 ppm), Th (up to 0.4 ppm), and REEs (up to 10 ppm). This rock unit might have acted as an external source for Cu, U, Th, REE, and carbon for the Cu-Co-U-REE mineralization related to the second biotite group ( Baidya et al.,
Rapidly searching for carbonatite-related rare earth element (REE) mineralized systems is of paramount importance to explorers, because these systems provide the world's most significant supply of REE. Biotite and barite are suitable indicator minerals that can offer reliable elemental geochemical information used for REE …
Concentration of Biotite per GRapi unit = 0.77 (%) Estimated Radioactivity from Biotite - barely detectable : Biotite Classification: Dana Class: 71.02.02b.02 Phyllosilicate Sheets of Six-Membered Rings : with 2:1 Layers : Mica Group (Biotite subgroup) 71.02.02b.01 ...
What is Biotite? Biotite is a name used for a large group of black mica minerals that are commonly found in igneous and metamorphic rocks. These include annite, phlogopite, …
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The biotite samples used in this study were not crushed to powder. The biotite flakes (K(Mg, Fe, Al) 3 (Si, Al) 4 SiO 3 O 10 (OH, F) 2, produced in Nellore, Andhra, Pradesh, India) were supplied by Nichika Inc. and were of uniform size (approximately 5 mm square and 150 µm thickness).Europium nitrate hexahydrate (99.9%) was purchased …
In this contribution, we compare textural relations and major-trace element-halogen chemistry of multiple generations of hydrothermal and metamorphic biotite from IOCG deposits located in the Khetri Copper Belt (KCB), western India. We also present U–Pb isotope monazite age and recalculate the chemical age of uraninite using …
In the late stage, biotite dissolution still continues from the edge and within biotite, which results in a fine comb-like texture for weathered biotite; vermiculite occurs …
The concentration of Rb and Cs in biotite is higher than K-feldspar, because the large Rb and Cs cations can fit more easily into the biotite crystal structure (Bernotat et al. 1976). The mean Rb and Cs contents of biotite and K-feldspar from the …
Modified date: 02/09/2023. Biotite is the most common mica mineral and also known as black mica, a silicate mineral in the common mica group. Approximate chemical formula K (Mg, Fe). It can be found in massive crystal layers weighing several hundred pounds. It is abundant in metamorphic rocks (both regional and contact), pegmatites, and also in ...
Cs concentration was set very low, to simulate actual contamination in Fukushima. ... Compared to the chemical composition of fresh biotite collected from Ono-town (Kikuchi et al., 2015), depletion of K and oxidation of Fe are distinct. ... Fuji Film) for 24 h. IPs were scanned with an IP reader (FLA-7000, Fuji Film), and the radioactivity of ...
The Cs concentration of the Aw-biotite (1.0 mmol kg −1) is too low to collapse the interlayer even if all the Cs was adsorbed in the interlayer. 3.3. Removal of the exchangeable Cs from biotite. After the Cs adsorption experiment, the Or-biotite sample was exposed to 1 M NH 4 CH 3 COO aqueous solution, and 4.4% of the Cs was desorbed.
Through petrological and mineral chemistry studies of the mafic hydrous phases of the Proterozoic quartz syenites along the NE margin of Cuddapah Intrusive Province (CIP) of the Eastern Dharwar Craton (EDC), we present the nature of the magmatic sources of the Mesoproterozoic Purimetla quartz syenite (PUQS) and the …
Abstract. The low-field magnetic susceptibility anisotropy (LMA) of weakly magnetic rocks is dominated by paramagnetic minerals among which micas, and mainly biotite, is important. For this reason, the LMA of biotite crystals was investigated in detail. Natural biotite crystals (from ten localities) having a wide range of iron concentration ...
The optical properties of biotite in the petrographic microscope indicate the following: In natural light it presents a characteristic brown or yellow-brown color. The very marked pleochroism is the optical property under the microscope that helps to identify this mineral. Relief: it is moderate. Exfoliation: Yes it presents and it is excellent.
The predicted XFe3+ and number of Fe3+ cations in biotite, chlorite, and staurolite broadly match natural observations, but for white mica the predicted mean XFe3+ is underestimated by 0.2–0.4 and the number of Fe3+ cations by 0.05–0.2. ... The weight per cent oxide concentrations for major elements in our bulk composition are close to ...
4.2. Data processing protocol. Step 1, for each reference biotite, the molar concentration of each ion is calculated (SiO 2, TiO 2, Al 2 O 3, Cr 2 O 3, FeO T, MnO, MgO, NiO, BaO, CaO, Na 2 O, K 2 O, Li 2 O, F, Cl). The FeO T content is converted from the original Fe 2 O 3 and FeO when both of them are provided. The element …
Within the cross-section, the median concentration of Co in biotite located at approximately 2200 m from the deposit center along the westward direction is 5 ppm, …
After 24 h of the adsorption experiment, approximately 97% of the Cs was adsorbed on the Or-biotite sample. The Cs concentration in the biotite sample was 0.97 mmol kg −1.The cation exchange capacity (CEC) of the same biotite (Nellore, India) was reported to be 102 mmol kg −1 (Kitayama et al., 2020).Therefore, the Cs concentration …
Concentration of protons in the batch titration reactors at time zero ( [H + ] t=0, atoms nm À2 ) against final measured pH (t = 20 or 60 min) at 25 °C and I of 0.01 or …
These observations further suggest that generation of the two-phase intergrowths cannot be ascribed to eutectic crystallization, but requires two coupled …
Biotite, a phyllosilicate mineral, possesses significant potential for cesium (Cs) adsorption owing to its negative surface charge, specific surface area (SSA), and frayed edge sites (FES). Notably, FES are known to play an important role in the adsorption of Cs. The objectives of this study were to investigate the Cs adsorption capacity and behavior of …
Effect of pH and collector concentration on the biotite and quartz in the presence of the single collector. ... As shown in the results above-mentioned, a compact and rigid adsorption film was generated when DDA or the mixed SDS/DDA collectors reacted with biotite owning to a lower ΔD value than 1 × 10 −6. Hence, the Sauerbrey …
Samples were immediately vacuum-packed in O 2-impermeable film bags (Escal film, ... (>90%) in all of the samples. Lower As concentration in smaller size biotite fractions, which are partly altered, imply different weathering rates and hence As release from this mineral, i.e., the finer biotite fractions have lost more As than the coarser ones.
Introduction. The copper deposits in the world are widely distributed across five continents including more than 150 countries 1.According to the proportion of oxide minerals and sulfide minerals in copper ores, it can be divided into sulfide ores containing copper oxide less than 10%, mixed ores containing copper oxide of 10–30% and oxide …
Mineral elements were released from the biotite incubated with and without A. niger in shaken-flask culture, and the concentrations of Al 3+, Fe 3+, Mg 2+, and K + in the supernatant of the shaken-liquid cultures with fungus were higher than in the controls without fungus: the differences were 17, 30, 15, and 13 ppm, respectively (Fig. …
Biotite is a common constituent of silicate bedrock. Its weathering releases plant nutrients and consumes atmospheric CO2. Because of its stoichiometric relationship with its transformational weathering product and sensitivity to botanical activity, calculating biotite weathering rates using watershed mass-balance methods has proven …
Amounts of 0.4 g of biotite were dispersed in 40 mL NaCl or CaCl 2 (1–100 mM) solutions. A U(VI) concentration of 2 × 10 − 4 M and a size fraction of < 3 mm of biotite were used. Although there is a possibility that U(VI) precipitates at near-neutral pH, higher U concentrations were used for the purpose of U(VI) interlayer adsorption.
The biotite weathering rate deduced from these data ranges from 7.8 × 10 −17 mol·m −2 ·s −1 to 6.5 × 10 −16 mol·m −2 ·s −1, which is consistent with the range of field rates previously reported. This rate was compared to the weathering rate of biotites induced by the substitution of vegetation occuring 35 years ago in a nearby ...
Abstract. The rate and stoichiometry of biotite dissolution were studied in the pH range 2–10 using thin-film continuous flow reactors. The release of interlayer K is relatively fast and becomes diffusion-controlled within a few days. The release rates of framework ions (Mg, Al, Fe, Si) are much slower and reach an apparent steady-state ...
Micro-flotation experiments showed that the recovery of biotite increased to above 90 % upon adding mixed SDS/DDA collectors under the concentration of 5 × 10 −4 mol/L with a molar ratio of 5:1 at alkaline pH (10–11), while that of quartz was below 10 %. The surface tension tests showed that the mixed collectors were easier to absorb on ...
Download scientific diagram | Aqueous concentrations of K, Si, Al, Fe, and Mg from the dissolution of biotite flakes (A) and biotite powders (B) after 70 h in solutions with different salinities ...
106 Citations. 1 Altmetric. Metrics. Abstract. Biomimetic assembly of high-quality nanosheets into nacre-like structures can produce macroscopic films with …
Here, KCl was recovered from the mica−acid reaction extract, using ethanol. The residue was treated for recovery of Al3+ as the ammonium alum, and Fe2+ was obtained as FeCl2. Biotite (10 kg ...
Abstract. Cations in formation brine can affect CO 2-induced dissolution of minerals during geologic CO 2 sequestration (GCS), affecting the GCS performance. This study investigated the dissolution of biotite with 0–4 M Na + and 0–10 mM K + under high temperature and high CO 2 pressure (i.e., 95 °C and 100 bar CO 2).At <0.5 M Na + …
Bray et al. (2014) demonstrated that the surface reactivity of biotite changes with pH and that the concentration of protons consumed ([H s +]) by biotite in contact …
As the concentration of Mg in the biotite structure is 5.9 atoms nm −3 (Eq. (21)), the depletion depth results (Fig. 8) suggest that 1 to 3 atoms nm −2 of Mg would have been removed from the biotite surface at the pH of most natural waters. This depletion corresponds to 20–50% Mg removal from the first unit cell of biotite.
The average biotite Cl concentration for each sample varies from 140 to 525 ppm. The chlorine concentration in biotite within pelites from different …
Biotite is an important adsorption carrier in the constituent minerals of Beishan granite. In this work, the effects of compaction density and ionic strength on the diffusion behavior of Se(IV) and Re(VII) in biotite were studied by capillary in-diffusion method and diffusion cell through-diffusion method. When the compaction density …
Samples of the drugs and heat-treated and untreated biotite minerals were characterized using X-ray diffraction analysis, Fourier-transform infra-red spectroscopy, thermogravimetric analysis and differential scanning calorimetry. Total and water-soluble cation concentrations of drugs were measured using atomic absorption spectrometry.