Research output: Contribution to journal › Article › peer-review
Coupled substitutions in natural MnO(OH) polymorphs : Infrared spectroscopic investigation. / Chukanov, Nikita V.; Varlamov, Dmitry A.; Pekov, Igor V.; Zubkova, Natalia V.; Kasatkin, Anatoly V.; Britvin, Sergey N.
In: Minerals, Vol. 11, No. 9, 969, 06.09.2021.Research output: Contribution to journal › Article › peer-review
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TY - JOUR
T1 - Coupled substitutions in natural MnO(OH) polymorphs
T2 - Infrared spectroscopic investigation
AU - Chukanov, Nikita V.
AU - Varlamov, Dmitry A.
AU - Pekov, Igor V.
AU - Zubkova, Natalia V.
AU - Kasatkin, Anatoly V.
AU - Britvin, Sergey N.
N1 - Chukanov, N.V.; Varlamov, D.A.; Pekov, I.V.; Zubkova, N.V.; Kasatkin, A.V.; Britvin, S.N. Coupled Substitutions in Natural MnO(OH) Polymorphs: Infrared Spectroscopic Investigation. Minerals 2021, 11, 969. https://doi.org/10.3390/min11090969
PY - 2021/9/6
Y1 - 2021/9/6
N2 - Solid solutions involving natural Mn3+O(OH) polymorphs, groutite, manganite, and feitknechtite are characterized and discussed based on original and literature data on the chemical composition, powder and single-crystal X-ray diffraction, and middle-range IR absorption spectra of these minerals. It is shown that manganite forms two kinds of solid-solution series, in which intermediate members have the general formulae (i) (Mn4+, Mn3+)O(OH,O), with pyrolusite as the Mn4+O2 end-member, and (ii) (Mn3+, M2+)O(OH, H2O), where M = Mn or Zn. In Zn-substituted man-ganite from Kapova Cave, South Urals, Russia, the Zn2+:Mn3+ ratio reaches 1:1 (the substitution of Mn3+ with Zn2+ is accompanied by the coupled substitution of OH− with H2O). Groutite forms solid-solution series with ramsdellite Mn4+O2. In addition, the incorporation of OH− anions in the 1 × 2 tunnels of ramsdellite is possible. Feitknechtite is considered to be isostructural with (or structurally related to) the compounds (M2+, Mn3+)(OH, O)2 (M = Mn, Zn) with a pyrochroite-related layered structure.
AB - Solid solutions involving natural Mn3+O(OH) polymorphs, groutite, manganite, and feitknechtite are characterized and discussed based on original and literature data on the chemical composition, powder and single-crystal X-ray diffraction, and middle-range IR absorption spectra of these minerals. It is shown that manganite forms two kinds of solid-solution series, in which intermediate members have the general formulae (i) (Mn4+, Mn3+)O(OH,O), with pyrolusite as the Mn4+O2 end-member, and (ii) (Mn3+, M2+)O(OH, H2O), where M = Mn or Zn. In Zn-substituted man-ganite from Kapova Cave, South Urals, Russia, the Zn2+:Mn3+ ratio reaches 1:1 (the substitution of Mn3+ with Zn2+ is accompanied by the coupled substitution of OH− with H2O). Groutite forms solid-solution series with ramsdellite Mn4+O2. In addition, the incorporation of OH− anions in the 1 × 2 tunnels of ramsdellite is possible. Feitknechtite is considered to be isostructural with (or structurally related to) the compounds (M2+, Mn3+)(OH, O)2 (M = Mn, Zn) with a pyrochroite-related layered structure.
KW - Feitknechtite
KW - Groutite
KW - IR spectroscopy
KW - Isomorphism
KW - Kapova Cave
KW - Manganite
KW - MnO(OH) polymorphs
KW - Pigment
KW - Solid solution
KW - South Urals
UR - http://www.scopus.com/inward/record.url?scp=85114285138&partnerID=8YFLogxK
U2 - 10.3390/min11090969
DO - 10.3390/min11090969
M3 - Article
AN - SCOPUS:85114285138
VL - 11
JO - Minerals
JF - Minerals
SN - 2075-163X
IS - 9
M1 - 969
ER -
ID: 86027643