The new lead oxychloride vanadate mineral erikjonssonite was discovered at the abandoned Kombat copper mine, Grootfontein district, Namibia, in association with hausmannite, calcite, glaucochroite, baryte, cerussite, and an insufficiently studied mineral chemically related to kombatite. Erikjonssonite forms thick tabular orange-red grains up to 0.3 × 0.5 × 0.5 mm3. The new mineral is brittle, has Mohs’ hardness of 2½ and an uneven fracture. Distinct cleavage on (010) is observed. Dcalc = 7.967 g/cm3. The reflectance values [Rmax, %/Rmin, % (λ, nm)] are: 20.4/18.9 (470), 19.0/17.6 (540), 18.5/17.1 (589), 18.0/16.6 (650). The infrared spectrum shows the absence of H-, C- and B-bearing groups. The chemical composition is (wavelength-dispersive mode electron microprobe, wt%): SiO2 0.86, V2O5 1.73, As2O5 0.96, MoO3 1.70, PbO 92.54, Cl 4.15, –O=Cl −0.94, total 101.00. The empirical formula based on 46 O + Cl atoms per formula unit (apfu) is Pb31.50()Σ4.07Cl8.89O37.11. The simplified formula is {(Pb32O21)[(V,Si,Mo,As)O4]4}Cl9. The crystal structure has been refined to R = 4.3% based on 7730 independent reflections with I > 2σ(I). Erikjonssonite is monoclinic, C2/c, a = 23.200(5), b = 22.708(5), c = 12.418(3) Å, β = 102.167(4)°, V = 6395(2) Å3, and Z = 4. The structure of erikjonssonite is very similar to that of hereroite: in both minerals two [Pb32O21]22+ oxocentred blocks formed by OPb4 tetrahedra with inserted TO4 tetrahedral groups alternate with one chloride sheet. Average <T–O> bond lengths in the tetrahedral groups demonstrate very similar values which is interpreted as both T1 and T2 sites having mixed occupancies of V5+, Si4+, Mo6+ and As5+, unlike hereroite where <T–O> bond lengths are different and one site is exclusively occupied by As5+. The strongest lines of the powder X-ray diffraction pattern [d, Å (I, %) (hkl)] are: 3.501 (24) (531, ), 2.980 (100) (551, ), 2.794 (45) (, ), 1.990 (24) (), 1.977 (21) (), 1.762 (20) (715, , 10.6.2), 1.648 (33) (). The mineral is named in honour of the Swedish mineralogist Erik Jonsson (b. 1967). The holotype material is deposited in the collections of the Fersman Mineralogical Museum of the Russian Academy of Sciences, Moscow, Russia. The concept of a “defect number (DN)” which is the number of O2– ions removed from the ideal [PbO] block per cavity area is suggested in order to classify the layered Pb oxychloride minerals structurally related to litharge.
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Research Article|
May 01, 2019
Erikjonssonite, (Pb32O21)[(V,Si,Mo,As)O4]4Cl9, a new mineral from the Kombat mine and structural classification of layered lead oxychlorides related to litharge
Nikita V. Chukanov;
1
Institute of Problems of Chemical Physics, Russian Academy of Sciences
, Chernogolovka, Moscow Region, 142432, Russia
Corresponding author, e-mail: nikchukanov@yandex.ru
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Oleg I. Siidra;
Oleg I. Siidra
2
Department of Crystallography, St. Petersburg State University
, University emb. 7/9, St. Petersburg, 199034, Russia
3
Nanomaterials Research Center, Kola Science Center, Russian Academy of Sciences
, Apatity, Murmansk Region, 184200, Russia
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Yury S. Polekhovsky;
Yury S. Polekhovsky
4
Department of Mineral Deposits, St. Petersburg State University
, University emb. 7/9, St. Petersburg, 199034, Russia
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Igor V. Pekov;
Igor V. Pekov
5
Faculty of Geology, Moscow State University
, Vorobievy Gory, Moscow, 119991, Russia
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Dmitry A. Varlamov;
Dmitry A. Varlamov
6
Institute of Experimental Mineralogy, Russian Academy of Sciences
, Chernogolovka, Moscow Region, 142432, Russia
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Vera N. Ermolaeva;
Vera N. Ermolaeva
6
Institute of Experimental Mineralogy, Russian Academy of Sciences
, Chernogolovka, Moscow Region, 142432, Russia
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Alla A. Virus
Alla A. Virus
6
Institute of Experimental Mineralogy, Russian Academy of Sciences
, Chernogolovka, Moscow Region, 142432, Russia
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1
Institute of Problems of Chemical Physics, Russian Academy of Sciences
, Chernogolovka, Moscow Region, 142432, Russia
Oleg I. Siidra
2
Department of Crystallography, St. Petersburg State University
, University emb. 7/9, St. Petersburg, 199034, Russia
3
Nanomaterials Research Center, Kola Science Center, Russian Academy of Sciences
, Apatity, Murmansk Region, 184200, Russia
Yury S. Polekhovsky
4
Department of Mineral Deposits, St. Petersburg State University
, University emb. 7/9, St. Petersburg, 199034, Russia
Igor V. Pekov
5
Faculty of Geology, Moscow State University
, Vorobievy Gory, Moscow, 119991, Russia
Dmitry A. Varlamov
6
Institute of Experimental Mineralogy, Russian Academy of Sciences
, Chernogolovka, Moscow Region, 142432, Russia
Vera N. Ermolaeva
6
Institute of Experimental Mineralogy, Russian Academy of Sciences
, Chernogolovka, Moscow Region, 142432, Russia
Alla A. Virus
6
Institute of Experimental Mineralogy, Russian Academy of Sciences
, Chernogolovka, Moscow Region, 142432, Russia
Corresponding author, e-mail: nikchukanov@yandex.ru
Publisher: Deutsche Mineralogische Gesellschaft, Sociedad Española de Mineralogia, Societá Italiana di Mineralogia e Petrologia, Société Francaise de Minéralogie
Received:
20 Jan 2019
Revision Received:
15 Mar 2019
Accepted:
21 Mar 2019
First Online:
10 Apr 2019
Online ISSN: 1617-4011
Print ISSN: 0935-1221
© 2019 E. Schweizerbart’sche Verlagsbuchhandlung, 70176 Stuttgart, Germany
European Journal of Mineralogy (2019) 31 (3): 619–628.
Article history
Received:
20 Jan 2019
Revision Received:
15 Mar 2019
Accepted:
21 Mar 2019
First Online:
10 Apr 2019
Citation
Nikita V. Chukanov, Oleg I. Siidra, Yury S. Polekhovsky, Igor V. Pekov, Dmitry A. Varlamov, Vera N. Ermolaeva, Alla A. Virus; Erikjonssonite, (Pb32O21)[(V,Si,Mo,As)O4]4Cl9, a new mineral from the Kombat mine and structural classification of layered lead oxychlorides related to litharge. European Journal of Mineralogy 2019;; 31 (3): 619–628. doi: https://doi.org/10.1127/ejm/2019/0031-2854
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Index Terms/Descriptors
- Africa
- arsenic
- chemical composition
- classification
- crystal chemistry
- crystal structure
- formula
- infrared spectra
- lead
- metals
- molybdenum
- Namibia
- new minerals
- physical properties
- reflectance
- silicon
- Southern Africa
- spectra
- vanadates
- vanadium
- X-ray diffraction data
- Kombat Mine
- oxychlorides
- oxyhalides
- Grootfontein Namibia
- lead oxyhalides
- erikjonssonite
- oxychloride vanadates
- layered oxyhalides
Latitude & Longitude
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