KASATKIN, Anatoly V., Fabrizio NESTOLA, Radek ŠKODA, Nikita V. CHUKANOV, Atali A. AGAKHANOV, Dmitriy I. BELAKOVSKIY, Arianna LANZA, Markéta HOLÁ and Mike S. RUMSEY. Hingganite-(Nd), Nd2 Be2Si2O8(OH)2, a new gadolinite-supergroup mineral from Zagi Mountain, Pakistan. The Canadian Mineralogist. Québec: Mineralogical Association of Canada, 2020, vol. 58, No 5, p. 549-562. ISSN 0008-4476. Available from: https://dx.doi.org/10.3749/canmin.2000039.
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Basic information
Original name Hingganite-(Nd), Nd2 Be2Si2O8(OH)2, a new gadolinite-supergroup mineral from Zagi Mountain, Pakistan
Authors KASATKIN, Anatoly V., Fabrizio NESTOLA, Radek ŠKODA (203 Czech Republic, belonging to the institution), Nikita V. CHUKANOV, Atali A. AGAKHANOV, Dmitriy I. BELAKOVSKIY, Arianna LANZA, Markéta HOLÁ (203 Czech Republic, belonging to the institution) and Mike S. RUMSEY.
Edition The Canadian Mineralogist, Québec, Mineralogical Association of Canada, 2020, 0008-4476.
Other information
Original language English
Type of outcome Article in a journal
Field of Study 10504 Mineralogy
Country of publisher Canada
Confidentiality degree is not subject to a state or trade secret
WWW URL
Impact factor Impact factor: 1.165
RIV identification code RIV/00216224:14310/20:00117560
Organization unit Faculty of Science
Doi http://dx.doi.org/10.3749/canmin.2000039
UT WoS 000602734700001
Keywords in English hingganite-(Nd); new mineral; gadolinite supergroup; crystal structure; Zagi Mountain; Pakistan
Tags rivok
Tags International impact, Reviewed
Changed by Changed by: Mgr. Marie Šípková, DiS., učo 437722. Changed: 21/1/2021 16:59.
Abstract
Hingganite-(Nd), ideally Nd-2 square Be2Si2O8(OH)(2), is a new gadolinite group, gadolinite supergroup mineral discovered at Zagi Mountain. near Kafoor Dheri, about 4 km S of Warsak and 30 km NW of Peshawar, Khyber Pakhtunkhwa Province, Pakistan. The new mineral forms zones measuring up to 1 x 1 mm(2) in loose prismatic crystals up to 0.7 cm long. where it is intergrown with hingganite-(Y). Other associated minerals include aegirine, microcline, fergusonite-(Y), and zircon. Ilingganite-(Nd) is dark greenish-brown, transparent, has vitreous luster and a white streak. It is brittle and has a conchoidal fracture. No cleavage or parting are observed. Mohs hardness is 51/2 -6. D-calc =4.690 g/cm(3). Hingganite-(Nd) is non-pleochroic, optically biaxial (+), alpha = 1.746(5), beta=1.766(5), gamma =1.792(6) (589 nm). 2 V-meas = 80(7)degrees; 2 V-ca(lc) = 84 degrees. Dispersion of optical axes was not observed. The average chemical composition of hingganite-(Nd) is as follows (wt.%; electron microprobe, BeO, B2O3, and Lu2O3 content measured by LA-ICP-MS;H2O calculated by stoichiometry): BeO 9.64, CaO 0.45, MnO 0.10, FeO 3.03, B2O3 0.42, Y2O3 8.75, La2O3 1.63, Ce2O3 12.89, Pr2O3 3.09, Nd2O3 16.90, Sm2O3 5.97, Eu2O3 1.08, Gd2O3 5.15, Tb2O3 0.50, Dy2O3 2.50, Ho2O3 0.33, Er2O3 0.84, Tm2O3 0.10, Yb2O3 0.44, Lu2O3 0.04, ThO2 0.13, SiO2 23.55, H2O 2.72, total 100.25. The empirical formula calculated on the basis of 2 Si apfu is (Nd0.513Ce0.401Y0.395 SM0.175Gd0.145Pr0.096DY0.068La0.051Ca0.04IEU0.031Er0.022Tb0.014Yb0.011Ho0.009Tm0.003Th0.003Lu1 0.001)(Sigma 1.979)(square 0 0.778Fe0.2152+Mn0.007)(Sigma 1.000)(Be1.967B0.062)Sigma 2.029Si2O8.46(OH)(1.54). Hingganite-(Nd) is monoclinic, space group P2(1/c) with a = 4.77193(15), b = 7.6422(2), c = 9.9299(2) A, beta= 89.851(2)degrees, V= 362.123(14) angstrom(3), and Z=2. The strongest lines of the powder X-ray diffraction pattern [d, angstrom (I, %) (hid)] are: 6.105 (95) (011), 4.959 (56) (002), 4.773 (100) (100), 3.462 (58) (102), 3.122 (68) (11 (2) over bar), 3.028 (61) (013), 2.864 (87) (121), 2.573 (89) (113). The crystal structure of hingganite-(Nd) was refined from single-crystal X-ray diffraction data to R = 0.034 for 2007 unique reflections with / > 2 sigma(/). The new mineral is named as an analogue of hingganite-(Y), hingganite-(Yb), and hingganite-(Ce), but with Nd dominant among the rare earth elements.
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