Physics and Chemistry of Minerals

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ISSN / EISSN : 0342-1791 / 1432-2021
Published by: Springer Nature (10.1007)
Total articles ≅ 3,129
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, Lupei Zhu, Ziyu Li, Tony Yu, David R. Edey, Yanbin Wang
Physics and Chemistry of Minerals, Volume 49, pp 1-13; https://doi.org/10.1007/s00269-022-01203-8

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Wei Chen, Shijie Huang, Zhilin Ye, Jiamei Song, Shanrong Zhang, Mengzeng Wu, Dawei Fan,
Physics and Chemistry of Minerals, Volume 49, pp 1-10; https://doi.org/10.1007/s00269-022-01201-w

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, , Chien-Hung Chen, Trevor A. Dumitru, Vladimir A. Skuratov, Rodney C. Ewing
Physics and Chemistry of Minerals, Volume 49, pp 1-9; https://doi.org/10.1007/s00269-022-01200-x

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Xuejing He, , Hiroyuki Kagi, Joseph R. Smyth, Kazuki Komatsu, Xiaoguang Li, Jing Gao, Li Lei
Physics and Chemistry of Minerals, Volume 49, pp 1-14; https://doi.org/10.1007/s00269-022-01196-4

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, Stuart J. Mills, Michael S. Rumsey, Matthias Weil, Werner Artner, John Spratt, Jens Najorka
Physics and Chemistry of Minerals, Volume 49, pp 1-16; https://doi.org/10.1007/s00269-022-01198-2

Abstract:
The crystal structure of montanite has been determined using single-crystal X-ray diffraction on a synthetic sample, supported by powder X-ray diffraction (PXRD), electron microprobe analysis (EPMA) and thermogravimetric analyses (TGA). Montanite was first described in 1868 as Bi2TeO6·nH2O (n = 1 or 2). The determination of the crystal structure of synthetic montanite (refined composition Bi2TeO6·0.22H2O) has led to the reassignment of the formula to Bi2TeO6·nH2O where 0 ≤ n ≤ $${\raise0.5ex\hbox{$\scriptstyle 2$} \kern-0.1em/\kern-0.15em \lower0.25ex\hbox{$\scriptstyle 3$}}$$2/3 rather than the commonly reported Bi2TeO6·2H2O. This change has been accepted by the IMA–CNMNC, Proposal 22-A. The PXRD pattern simulated from the crystal structure of synthetic montanite is a satisfactory match for PXRD scans collected on both historical and recent natural samples, showing their equivalence. Two specimens attributed to the original discoverer of montanite (Frederick A. Genth) from the cotype localities (Highland Mining District, Montana and David Beck’s mine, North Carolina, USA) have been designated as neotypes. Montanite crystallises in space group P $$\overline{6 }$$6¯ , with the unit-cell parameters a = 9.1195(14) Å, c = 5.5694(8) Å, V = 401.13(14) Å3, and three formula units in the unit cell. The crystal structure of montanite is formed from a framework of BiOn and TeO6 polyhedra. Half of the Bi3+ and all of the Te6+ cations are coordinated by six oxygen atoms in trigonal-prismatic arrangements (the first example of this configuration reported for Te6+), while the remaining Bi3+ cations are coordinated by seven O sites. The H2O groups in montanite are structurally incorporated into the network of cavities formed by the three-dimensional framework, with other cavity space occupied by the stereoactive 6s2 lone pair of Bi3+ cations. While evidence for a supercell was observed in synthetic montanite, the subcell refinement of montanite adequately indexes all reflections in the PXRD patterns observed in all natural montanite samples analysed in this study, verifying the identity of montanite as a mineral.
, Giorgio Guastella, Silvia C. Capelli, , Alessandro Guastoni
Physics and Chemistry of Minerals, Volume 49, pp 1-13; https://doi.org/10.1007/s00269-022-01199-1

Abstract:
The crystal structure and crystal chemistry of meyerhofferite, ideally CaB3O3(OH)5·H2O, was investigated by a multi-methodological approach based on titrimetric determination of boron, gravimetric determination of calcium, determination of fluorine by ion selective electrode, determination of water content by heating, other minor elements by inductively coupled plasma atomic emission spectroscopy, along with single-crystal synchrotron X-ray and neutron diffraction. The concentration of more than 50 chemical elements was measured. The combination of these techniques proves that the composition of meyerhofferite approaches the ideal one (i.e., (Ca1.012Mg0.003) (B2.984Si0.001)O3(OH)5·1.018H2O), with only a modest fraction of Mg (with MgO ≈ 0.03 wt%) replacing Ca, and with Si the only potential substituent of tetrahedral B (with SiO2 ≈ 0.02 wt%). The content of REE and other minor elements is, overall, not significant, including that of fluorine as a potential OH substituent (i.e., < 0.01 wt%). These findings have some relevant geochemical and technical implications, here discussed. The X-ray and neutron structure model obtained in this study prove that the building units of the structure of meyerhofferite consist of: two BO2(OH)2 tetrahedra and one BO2(OH) triangle, linked by corner-sharing to form [B3O3(OH)5]2− rings, and distorted Ca-polyhedra (with CN = 8, CaO3(OH)4(OH2)), linked by edge-sharing to form infinite chains along [001]. The B3O3(OH)5 rings are connected to the Ca-polyhedra chains by corner- and edge-sharing, on two sides of the chains. These heteropolyhedral chains, made by Ca-polyhedra and B3O3(OH)5 rings, are mutually connected through hydrogen bonding only, giving rise to the tri-dimensional edifice of meyerhofferite. The neutron structure refinement showed no evidence of static or dynamic disorder pertaining to the H sites; their libration regime was found to be significantly anisotropic. At least seven of the nine oxygen sites of the structure are involved in H-bonding, as donors or as acceptors. The role played by the H-bonding scheme on the physical properties of meyerhofferite is discussed.
, Arie P. Van Den Berg, Rainer Schmid-Fetzer, Jellie de Vries, Wim van Westrenen, Yue Zhao
Physics and Chemistry of Minerals, Volume 49, pp 1-18; https://doi.org/10.1007/s00269-022-01195-5

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, Michel Gauthier, Nicki C. Siersch, , , , Sofia Balugani, Cécile Bretonnet, Thibault Delétang, Maëva Guillot, et al.
Physics and Chemistry of Minerals, Volume 49, pp 1-22; https://doi.org/10.1007/s00269-022-01194-6

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