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Journal Article

CLINOMETABORITE, NATURAL β-METABORIC ACID, FROM LA FOSSA CRATER, VULCANO, AEOLIAN ISLANDS, ITALY Available to Purchase

Francesco Demartin, Carlo Maria Gramaccioli, Italo Campostrini
Published: 01 October 2011
The Canadian Mineralogist (2011) 49 (5): 1273–1279.
DOI: https://doi.org/10.3749/canmin.49.5.1273
...Francesco Demartin; Carlo Maria Gramaccioli; Italo Campostrini Abstract Clinometaborite, β-HBO 2 , the monoclinic modification of metaboric acid, which has long been known as a synthetic product only, was found as a sublimate in an active medium-temperature intracrater fumarole at La Fossa crater...
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View PDF for article title, CLINOMETABORITE, NATURAL β-<span class="search-highlight">METABORIC</span> ACID, FROM LA FOSSA CRATER, VULCANO, AEOLIAN ISLANDS, ITALY
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Cross plots for QXRD- and ICP-AES-derived data, SM1 borehole. A. % polyhalite (XRD) vs. K-derived % polyhalite (ICP-AES), using traditional, slow lithium metaborate fusion prior to ICP-AES. B. % polyhalite (XRD) vs. K-derived % polyhalite (ICP-AES), using new, rapid lithium metaborate fusion prior to ICP-AES. C. % polyhalite (XRD) vs. Ca-derived % polyhalite (ICP-AES), using traditional, slow lithium metaborate fusion prior to ICP-AES. D. % halite (XRD) vs. Na-derived % halite (ICP-AES), using traditional, slow lithium metaborate fusion prior to ICP-AES.

Cross plots for QXRD- and ICP-AES-derived data, SM1 borehole. A. % polyhali... Open Access

Published: 01 May 2016
Fig. 7 Cross plots for QXRD- and ICP-AES-derived data, SM1 borehole. A. % polyhalite (XRD) vs. K-derived % polyhalite (ICP-AES), using traditional, slow lithium metaborate fusion prior to ICP-AES. B. % polyhalite (XRD) vs. K-derived % polyhalite (ICP-AES), using new, rapid lithium metaborate
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Depiction of typical superstructural units found in borate glasses and crystals (a) boroxol ring, (b) triborate ring, (c) di-triborate ring, (d) diborate unit, (e) pentaborate unit, (f) di-pentaborate unit, (g) tri-pentaborate, (h) metaborate chain, (i) metaborate ring, (j) pyroborate, (k) orthoborate, (l) orthobo-rate ring with three linked [BØ2O2]3−Td-orthoborate units; and finally two large polyanions, known from crystals and suggested to exist “(m) as di-pentaborate anion [B5O11]7− in bismuth-metaborate glass or (n) as bi-diborate polyanion [B10O21]12− in lead-metaborate glass (Kamitsos and Chryssikos 1991; Wright et al. 2010; Wright 2014; Möncke et al. 2015; Möncke 2017).

Depiction of typical superstructural units found in borate glasses and crys... Available to Purchase

Published: 01 May 2022
Figure 20. Depiction of typical superstructural units found in borate glasses and crystals (a) boroxol ring, (b) triborate ring, (c) di-triborate ring, (d) diborate unit, (e) pentaborate unit, (f) di-pentaborate unit, (g) tri-pentaborate, (h) metaborate chain, (i) metaborate
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Depiction of the various borate species that are known to exist in glasses and crystals. While all trigonal species, as well as the tetrahedral metaborate in the bottom row, are typically found in alkali or alkaline earth borate glasses, the tetrahedral pyro- and ortho-species are less typical though they might occur in lead or bismuth metaborate glass for the pyroborate and in Mn- or Eu-containing orthoborate glasses for the orthoborate unit (see the text for more details).

Depiction of the various borate species that are known to exist in glasses ... Available to Purchase

Published: 01 May 2022
Figure 18. Depiction of the various borate species that are known to exist in glasses and crystals. While all trigonal species, as well as the tetrahedral metaborate in the bottom row, are typically found in alkali or alkaline earth borate glasses, the tetrahedral pyro- and ortho-species are less
Journal Article

Major and trace elements in meimechites – rarely occurring volcanic rocks: developing optimal analytical strategy Available to Purchase

Galina V. Pashkova, Svetlana V. Panteeva, Natalia N. Ukhova, Victor M. Chubarov, Alexandr L. Finkelshtein, Alexei V. Ivanov, Alexey M. Asavin
Published: 24 September 2018
Geochemistry: Exploration, Environment, Analysis (2019) 19 (3): 233–243.
DOI: https://doi.org/10.1144/geochem2017-099
...) methods was suggested for the determination of the elemental composition of meimechites. The preparation of glass beads using a lithium tetraborate and metaborate mixture proved to be suitable for the XRF determination of major oxides. A comparative study of the sample decomposition procedures...
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Journal Article

Effect of Heat Treatment On Chambersite Crystal Structure and Morphology Available to Purchase

Pengfei Wang, Jianfeng Sun, Qingguo Tang, Shuang Yang, Zishuai Xu, Xiaozhan Mu
Published: 30 May 2018
The Canadian Mineralogist (2018) 56 (3): 223–233.
DOI: https://doi.org/10.3749/canmin.1700072
... from the orthorhombic system to the cubic system occurred at 408–410 °C. At 900 °C chambersite was partially decomposed to form new crystals such as manganese metaborate [Mn(BO 2 ) 2 ] and iron oxoborate (Fe 3 BO 6 ); the manganese metaborate further decomposed into manganese oxide and boric acid...
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Chemical analysis of marble samples by fusion with metaborate/tetraborate a... Available to Purchase

Published: 01 February 2017
Table 2. Chemical analysis of marble samples by fusion with metaborate/tetraborate and ICP analysis, conducted by Activation Labs, Inc. More details on sample locations provided in Supplementary Information .
Journal Article

Characterization Study of some Bauxite Deposits in Northern Brazil Available to Purchase

Barbara da Rocha Pereira, Morgana Rosset, José Diogo de Oliveria Lima, Keila Palheta Gomes, Denise Crocce Romano Espinosa, Jorge Alberto Soares Tenório
Published: 01 December 2023
Clays and Clay Minerals (2023) 71 (6): 707–721.
DOI: https://doi.org/10.1007/s42860-023-00264-2
... plateau in northern Brazil. The samples were solubilized by multi-acid digestion and fusion with lithium metaborate to quantify their metal compositions by inductively coupled plasma optical emission spectrometry (ICP-OES). The mineralogical characterization was conducted by X-ray diffraction (XRD...
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Comparison of methods for the geochemical determination of rare earth elements: Rock Canyon Creek REE–F–Ba deposit case study, SE British Columbia, Canada Available to Purchase

Carlee Akam, George J. Simandl, Ray Lett, Suzanne Paradis, Mihoko Hoshino, Yoshiaki Kon, Daisuke Araoka, Craig Green, Shinsuke Kodama, Tetsuichi Takagi, Manzur Chaudhry
Published: 18 April 2019
Geochemistry: Exploration, Environment, Analysis (2019) 19 (4): 414–430.
DOI: https://doi.org/10.1144/geochem2018-044
... analysed in 2009 and were subsequently compared to sample subsets re-analysed using lithium metaborate-tetraborate (LMB) fusion ICP mass spectroscopy (ICP-MS), Na 2 O 2 fusion ICP-MS, and LMB fusion-XRF. We determine that LMB ICP-MS and Na 2 O 2 ICP-MS accurately determined REE concentrations in control...
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View PDF for article title, Comparison of methods for the geochemical determination of rare earth elements: Rock Canyon Creek REE–F–Ba deposit case study, SE British Columbia, Canada
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Journal Article

Advances in understanding the structure of borosilicate glasses: A Raman spectroscopy study Available to Purchase

D. Manara, A. Grandjean, D.R. Neuville
Published: 01 May 2009
American Mineralogist (2009) 94 (5-6): 777–784.
DOI: https://doi.org/10.2138/am.2009.3027
... and borosilicate units including tetra-coordinated boron seem to be unstable at high temperature, where the formation of metaborate chains or rings is fostered. Above 1500 °C, evaporation of borate compounds is clearly observed, stemming from the small sample size. 12 12 2008 23 05 2008 © 2009...
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View PDF for article title, Advances in understanding the structure of borosilicate glasses: A Raman spectroscopy study
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Major element composition of Wilkes Formation tephra layers. Determinations... Available to Purchase

Published: 01 June 2013
TABLE 1— Major element composition of Wilkes Formation tephra layers. Determinations by X-ray fluorescence, using Rigaku model 3070 XRF spectrometer, analyzing glass discs prepared by fusing 3.50 g of rock powder with 7.00 g lithium metaborate flux at 1000 °C.
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Dependence of transition temperature on the modifier cations in binary MO–B2O3 glasses. (a) shows the dependence on the force constant of the M–O bond as derived from far infrared measurements, and (b) the fraction of tetrahedral borate groups (N4) as different cations favor different sides of the metaborate equilibrium or disproportionation. Modified after Möncke et al. (2016).

Dependence of transition temperature on the modifier cations in binary MO–B... Available to Purchase

Published: 01 May 2022
different sides of the metaborate equilibrium or disproportionation. Modified after Möncke et al. (2016) .
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First and second boron anomaly for SrO–B2O3 glasses. Diamonds denote data from Ohta et al. (1982) for the binary system xB2O3 − (100 − x) sytem with light blue colored symbols for the Al-free system and blue and white split diamonds for the glasses conatining 3 mol% Al2O3, the maximum reflects on the equilibrium of trigonal and tetrahedral metaborate. The round symbols are from Winterstein et al. (2013) who found a second boron anomaly as trigoanl orthoborate is in equilibrium with tetrahedral orthoborate units in the ternary xB2O3–xSrO–(100 − 2x)MnO.

First and second boron anomaly for SrO–B 2 O 3 glasses. Diamonds denote da... Available to Purchase

Published: 01 May 2022
% Al 2 O 3 , the maximum reflects on the equilibrium of trigonal and tetrahedral metaborate. The round symbols are from Winterstein et al. (2013) who found a second boron anomaly as trigoanl orthoborate is in equilibrium with tetrahedral orthoborate units in the ternary x B 2 O 3 – x SrO–(100 − 2
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Stratigraphy of the uppermost Lower Chalk and basal White Chalk formations at Beachy Head, Eastbourne, Sussex, UK. The lithostratigraphical divisions follow Gale (1995, 1996). The sequence stratigraphy and sea-level curve are modified from Robaszynski et al. (1998). D32–E25 are numbered sedimentary couplets which are formed in response to 20 ka precession cycles (Gale 1995; Gale et al. 1999a). Also plotted are carbon- and oxygen-isotope values, and sulphur and aluminium oxide (Al2O3) content (the latter being an indication of the percentage of clay in the sediment). To determine Al2O3 content, powdered rock was dissolved using a lithium metaborate fusion prior to analysis by ICP–AES. Plenus Marl Member Bed 1 (couplets E1–E3) and Bed 8 (couplet E7) are highlighted for reference.

Stratigraphy of the uppermost Lower Chalk and basal White Chalk formations ... Available to Purchase

Published: 01 July 2000
). To determine Al 2 O 3 content, powdered rock was dissolved using a lithium metaborate fusion prior to analysis by ICP–AES. Plenus Marl Member Bed 1 (couplets E1–E3) and Bed 8 (couplet E7) are highlighted for reference.
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Measured count rates and calculated detection limits for LA-ICP-MS analyses of Li, Be, and B using sector field and quadrupole ICP-MS. (a) Measured count rates (in counts/s/ppm) for Li, Be, and B as a function of laser spot diameter measured in NIST 612 and BCR-2G glasses. Count rates for Li and B have been corrected for isotopic abundance. (b) Calculated detection limits (using the method of Perkins and Pearce 1995) in ppm (by weight). Calculations are based on measured intensities of 7Li, 9Be, and 11B. Background count rates for 7Li, 9Be, and 11B were ~3000–5000, 20–60, and 2500–4000 counts/s for the sector field instrument and ~6000, 20, and 300 counts/s for the quadrupole. Note that the quadrupole instrument used in this study has a high Li background due to an unfortunate encounter with a lithium metaborate flux in 2001, and more representative detection limits (shown above as “Li adjusted”) also have been calculated using a background count rate of 300 counts/s. Reported detection limits form the studies of Gao et al. (2002), Kuosawa et al. (2002), and Tiepolo et al. (2005) are also shown for comparison in b.

Measured count rates and calculated detection limits for LA-ICP-MS analyses... Available to Purchase

Published: 01 August 2006
–5000, 20–60, and 2500–4000 counts/s for the sector field instrument and ~6000, 20, and 300 counts/s for the quadrupole. Note that the quadrupole instrument used in this study has a high Li background due to an unfortunate encounter with a lithium metaborate flux in 2001, and more representative
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(a) Raman spectrum in the frequency range 650 to 1150 cm−1 of the glass part of a rehomogenized B-type melt inclusion in pegmatite quartz (550 °C, 1 kbar, 96 hours). The sharp bands result from the quartz host. The broad band in the 850 to 970 cm−1 region is characteristic for B-, F-, P-, and H2O-rich silicate melts. The partial spectrum in the frequency range 850 to 1000 cm−1 shows the Gaussian deconvolution into the three bands centered at 823, 922, and 954 cm−1. (b) Raman spectrum of a B-, F-, P-, and H2O-rich synthetic haplopegmatite glass in the low frequency region (200–1400 cm−1). This spectrum is characterized by an asymmetric broad band in the 480–490 cm−1 region, a broad, more or less symmetric band between 850 and 970 cm−1 with the planar orthoborate three-coordinated boron νs(B[3]-O) mode at 882 cm−1 (see the inserted partial spectrum). (c) Variation of Raman frequencies of B- and H2O-rich glass and melt with temperature. The dominant Raman band, with its maximum near 880 cm−1 at room temperature, shows anomalous behavior (see Fig. 1) when compared to H3BO3 in solution. Starting with a temperature of 350 °C the frequency increases. The abrupt change is interpreted as glass transition temperature TG. With the break in slope at TG a new band appears at 784 cm−1, which is assigned to the tetragonal coordinated νS(B[4]-O) mode (see inset) of monoclinic metaboric acid (HBO2-II), which forms a three-dimensional tetrahedral network (Gmelin 1983).

( a ) Raman spectrum in the frequency range 650 to 1150 cm −1 of the glass... Available to Purchase

Published: 01 January 2002
the frequency increases. The abrupt change is interpreted as glass transition temperature T G . With the break in slope at T G a new band appears at 784 cm −1 , which is assigned to the tetragonal coordinated ν S (B [4] -O) mode (see inset) of monoclinic metaboric acid (HBO 2 -II), which forms a three
Journal Article

Refractory element mobility in volcanic soils Available to Purchase

Andrew C. Kurtz, Louis A. Derry, Oliver A. Chadwick, Mary Jo Alfano
Journal: Geology
Published: 01 August 2000
Geology (2000) 28 (8): 683–686.
DOI: https://doi.org/10.1130/0091-7613(2000)28<683:REMIVS>2.0.CO;2
... of powder was weighed into a disposable graphite crucible (SPEX CertiPrep, Inc.) with 700 mg of flux (1:1 mix of Li-metaborate and Li-tetraborate, SPEX CertiPrep, Inc.). Samples were fused for 30 min in a 1000 °C muffle furnace. Fused samples were dissolved in a 10% HNO 3 + 1% HF solution...
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Journal Article

An Improved Approach to Characterize Potash-Bearing Evaporite Deposits, Evidenced in North Yorkshire, United Kingdom Open Access

S. J. Kemp, F. W. Smith, D. Wagner, I. Mounteney, C. P. Bell, C. J. Milne, C. J. B. Gowing, T. L. Pottas
Journal: Economic Geology
Published: 01 May 2016
Economic Geology (2016) 111 (3): 719–742.
DOI: https://doi.org/10.2113/econgeo.111.3.719
...Fig. 7 Cross plots for QXRD- and ICP-AES-derived data, SM1 borehole. A. % polyhalite (XRD) vs. K-derived % polyhalite (ICP-AES), using traditional, slow lithium metaborate fusion prior to ICP-AES. B. % polyhalite (XRD) vs. K-derived % polyhalite (ICP-AES), using new, rapid lithium metaborate...
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Glass as a State of Matter—The “newer” Glass Families from Organic, Metallic, Ionic to Non-silicate Oxide and Non-oxide Glasses Available to Purchase

Doris Möncke, Brian Topper, Alexis G. Clare
Published: 01 May 2022
Reviews in Mineralogy and Geochemistry (2022) 87 (1): 1039–1088.
DOI: https://doi.org/10.2138/rmg.2022.87.23
...Figure 20. Depiction of typical superstructural units found in borate glasses and crystals (a) boroxol ring, (b) triborate ring, (c) di-triborate ring, (d) diborate unit, (e) pentaborate unit, (f) di-pentaborate unit, (g) tri-pentaborate, (h) metaborate chain, (i) metaborate...
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View PDF for article title, Glass as a State of Matter—The “newer” Glass Families from Organic, Metallic, Ionic to Non-silicate Oxide and Non-oxide Glasses
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BEHAVIOR OF INCOMPATIBLE ELEMENTS DURING ULTRAHIGH-PRESSURE METAMORPHISM ( by the example of rocks of the Kokchetav massif ) Available to Purchase

V.S. Shatsky, E.S. Sitnikova, O.A. Koz’menko, S.V. Palessky, I.V. Nikolaeva, A.A. Zayachkovsky
Published: 01 April 2006
Russ. Geol. Geophys. (2006) 47 (4): 485–498.
... drawbacks. The synthesized lithium metaborate is highly pure and contains 20% excess Li 2 CO 3 . On fusion, the excess Li 2 CO 3 ensures a more alkaline alloy, which then more quickly dissolves in the acid. To enhance the stability of the obtained solution, we added HF and increased the total acidity...
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