Hingganite-(Nd), Nd2 Be2Si2O8(OH)2, a new gadolinite-supergroup mineral from Zagi Mountain, Pakistan

Result code in IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F00216224%3A14310%2F20%3A00117560" target="_blank" >RIV/00216224:14310/20:00117560 - isvavai.cz</a>

Result on the web

<a href="https://doi.org/10.3749/canmin.2000039" target="_blank" >https://doi.org/10.3749/canmin.2000039</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.3749/canmin.2000039" target="_blank" >10.3749/canmin.2000039</a>

Result language

angličtina

Original language name

Hingganite-(Nd), Nd2 Be2Si2O8(OH)2, a new gadolinite-supergroup mineral from Zagi Mountain, Pakistan

Original language description

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 / &gt; 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.

Czech name

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Czech description

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Type

J_imp - Article in a specialist periodical, which is included in the Web of Science database

CEP classification

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OECD FORD branch

10504 - Mineralogy

Project

—

Continuities

I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace

Publication year

2020

Confidentiality

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Name of the periodical

The Canadian Mineralogist

ISSN

0008-4476

e-ISSN

1499-1276

Volume of the periodical

58

Issue of the periodical within the volume

5

Country of publishing house

CA - CANADA

Number of pages

14

Pages from-to

549-562

UT code for WoS article

000602734700001

EID of the result in the Scopus database

2-s2.0-85098618288