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Potassic-hastingsite, KCa2(Fe2+4Fe3+)(Si6Al2)O22(OH)2, from the Keshiketeng Banner, Inner Mongolia, China: description of the neotype and its implication

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Abstract

Potassic-hastingsite (IMA2018–160), ideally KCa2(Fe2+4Fe3+)(Si6Al2)O22(OH)2,was discovered in Danailingou, Inner Mongolia, China. Potassic-hastingsite is black to dark green with a vitreous luster, brittle with conchoidal fracture. The {110} cleavage is perfect and the calculated density is 3.541 g·cm−3. It is biaxial negative with α = 1.708 (2), β = 1.716 (3) and γ = 1.718 (3). Combined electron probe,icro-analyser (EPMA) and Mössbauer spectroscopy data yielded 35.02 wt% SiO2, 0.35 wt% TiO2, 10.69 wt% Al2O3, 0.03 wt% Cr2O3, 7.33 wt% Fe2O3, 26.08 wt% FeO, 11.35 wt% CaO, 0.43 wt% MnO, 0.23 wt% MgO, 0.061 wt% Na2O, 2.79 wt% K2O, F 0.00 wt%, Cl 2.79 wt%, Cl ≡ O − 0.67 wt%, and H2O+ 1.43 wt%, resulting in an analytical total of 98.66 wt%. The empirical structural formula, calculated based of the assumption of a total of 24 anions per formula unit and OH + F + Cl = 2 atoms per formula unit (apfu) at the W site is A(K0.61Na0.20Ca0.07)0.88BCa2.00C(Fe2+3.72Fe3+0.94Al0.12Mn0.06Mg0.06Ti0.04Ni0.01)4.96T(Si5.97Al2.03)O22(OH1.14Cl0.86). The derived simplified formula is (K,Na,□)Ca2(Fe2+,Fe3+)5[(Si,Al)6Al2]O22(OH,Cl)2. Potassic-hastingsite is monoclinic, space group C2/m, with the unit-cell parameters a = 9.9405(7) Å; b = 18.2561(19) Å; c = 5.3501(3) Å; β = 105.117(5)°; V = 937.304(11) Å3; Z = 2. The structure was solved (R1 0.044) using all measured independent data and the reflections with I>2σ (I). The strongest six X-ray powder-diffraction lines [d in Å; (I/I0); (hkl)] are 8.504 (100) (110), 3.417 (35) (131), 3.155 (60) (310), 2.735 (70) (151), 2.623 (35) (061) and 2.570 (35) (\( \overline{2} \)02).

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Acknowledgements

Thanks are due to Qu Kai for his help in the analytical work and writing the manuscript. Constructive comments of two anonymous experts and journal editor Nikita V. Chukanov are gratefully acknowledged. This study was supported in the framework of China Geological Survey project DD20190054 and Sichuan Science and Technology project 2019YJ0270.

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Authors and Affiliations

  1. Chengdu Geological Survey Center, China Geological Survey, Chengdu, 610081, China

    Guangming Ren, Qiuxiao Liu & Ganfu Shen

  2. Laboratory of Crystal Structure, China University of Geosciences (Beijing), Beijing, 100083, China

    Guowu Li

  3. Yunnan Jewelry Scientific Research Institute, Kunming, 650011, China

    Jiaxin Shi

  4. School of Earth Sciences and Info-physics, Central South University, Changsha, 410083, China

    Xiangping Gu

  5. Beijing Research Institute of Uranium Geology, Beijing, 100029, China

    Guang Fan & Apeng Yu

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  1. Guangming Ren
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Correspondence to Guangming Ren.

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Ren, G., Li, G., Shi, J. et al. Potassic-hastingsite, KCa2(Fe2+4Fe3+)(Si6Al2)O22(OH)2, from the Keshiketeng Banner, Inner Mongolia, China: description of the neotype and its implication. Miner Petrol 114, 403–412 (2020). https://doi.org/10.1007/s00710-020-00717-9

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