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Hitachiite, Pb5Bi2Te2S6, a new mineral from the Hitachi mine, Ibaraki Prefecture, Japan

Published online by Cambridge University Press:  15 July 2019

Takahiro Kuribayashi*
Department of Earth Science, Graduate School of Science, Tohoku University, Sendai 980-8578, Japan
Toshiro Nagase
The Tohoku University Museum, Tohoku University, Sendai 980-8578, Japan
Tatsuo Nozaki
Research and Development Centre for Submarine Resources, Japan Agency for Marine-Earth Science and Technology, Yokosuka, 237-0061, Japan Frontier Research Centre for Energy and Resources, School of Engineering, The University of Tokyo, Tokyo 113-8656, Japan Department of Planetology, Kobe University, Kobe 657-8501, Japan Ocean Resources Research Centre for Next Generation, Chiba Institute of Technology, Narashino 275-0016, Japan
Junichiro Ishibashi
Department of Earth and Planetary Sciences, Faculty of Science, Kyushu University, Fukuoka 819-0395, Japan
Kazuhiko Shimada
Department of Earth and Planetary Sciences, Faculty of Science, Kyushu University, Fukuoka 819-0395, Japan
Masaaki Shimizu
Department of Earth System Science, Graduate School of Science and Engineering for Education, University of Toyama, Toyama 930-8555, Japan
Koichi Momma
Department of Geology and Paleontology, National Museum of Nature and Science, Tsukuba 305-0005, Japan.
*Author for correspondence: T. Kuribayashi, Email:


Hitachiite, Pb5Bi2Te2S6, is a new mineral discovered in the Hitachi mine, located in the Ibaraki Prefecture of Japan. The mean of 21 electron microprobe analyses gave: Pb 52.01, Bi 23.06, Fe 0.69, Sb 0.17, Te 13.74, S 9.71, Se 0.54, total 100.04 wt.%. The empirical chemical formula based on 15 apfu is (Pb4.75Fe0.23)Σ4.98(Bi2.09Sb0.03)Σ2.12Te2.04(S5.73Se0.13)Σ5.86, ideally Pb5Bi2Te2S6. Synchrotron single-crystal X-ray diffraction experiments indicated that hitachiite has trigonal symmetry, space group P${\bar 3}$m1, with a = 4.2200(13) Å, c = 27.02(4) Å and Z = 1. The four strongest diffraction peaks shown in the powder X-ray pattern [d, Å (I)(hkl)] are: 3.541(35)(012), 3.391(59)(013), 3.039(100)(015) and 2.114(56)(110). The calculated density (Dcalc) for the empirical chemical formula is 7.54 g/cm3.

The crystal structure of hitachiite has been refined using synchrotron single-crystal X-ray diffraction data, to R = 7.38% and is based on ABC-type stacking of 15 layers (five Pb, two Bi, two Te, and six S layers) along the [001] direction, and with each layer ideally containing only one kind of atom. The stacking sequence is described as Te–Bi–S–Pb–S–Pb–S–Pb–S–Pb–S–Pb–S–Bi–Te. The discovery of hitachiite implies that the minerals of the Bi2Te2S–PbS join might form a homologous series of Bi2Te2nPbS.

Copyright © Mineralogical Society of Great Britain and Ireland 2019 

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Associate Editor: František Laufek


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