Research output: Contribution to journal › Article › peer-review
Crystal chemistry and nomenclature of the lovozerite group. / Pekov, Igor V.; Krivovichev, Sergey V.; Zolotarev, Andrey A.; Yakovenchuk, Viktor N.; Armbruster, Thomas; Pakhomovsky, Yakov A.
In: European Journal of Mineralogy, Vol. 21, No. 5, 09.2009, p. 1061-1071.Research output: Contribution to journal › Article › peer-review
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TY - JOUR
T1 - Crystal chemistry and nomenclature of the lovozerite group
AU - Pekov, Igor V.
AU - Krivovichev, Sergey V.
AU - Zolotarev, Andrey A.
AU - Yakovenchuk, Viktor N.
AU - Armbruster, Thomas
AU - Pakhomovsky, Yakov A.
PY - 2009/9
Y1 - 2009/9
N2 - The paper summarizes crystal-chemical data and describes the IMA-accepted nomenclature of lovozerite-group minerals (LGM). The lovozerite group includes nine zeolite-like cyclosilicates with the general formula A3B 3C2MSi6O12O6-x(OH) x.nH2O, with species-defining M = Zr, Ti, Fe3+, Ca; C = Ca, Mn2+, Na, □ A = Na, Ca; B = Na, □ 0 ≤ x ≤ 6; n = 0-1. Their structures are based upon a heteropolyhedral framework consisting of rings of Si-centred tetrahedra and M-centred octahedra forming a 3D system of channels that host A, B, and C cations. The structures can be also considered as based upon pseudocubic modules centred at the midpoint of the Si tetrahedral ring. The M, A, and B cations are located at the borders of the module, whereas C cations are inside the module. The modules are stacked in three different arrangements in LGM allowing distinction of three subgroups: (1) zirsinalite-lovozerite subgroup (includes cation-saturated combeite, kapustinite, kazakovite and zirsinalite, and cation-deficient litvinskite, lovozerite and tisinalite), (2) koashvite subgroup (incl. koashvite) and (3) imandrite subgroup (incl. imandrite). The nature of cation-deficient LGM is discussed. The calculation scheme for empirical formulae of LGM and the criteria of definition of a mineral species (end-members) in the group are given.
AB - The paper summarizes crystal-chemical data and describes the IMA-accepted nomenclature of lovozerite-group minerals (LGM). The lovozerite group includes nine zeolite-like cyclosilicates with the general formula A3B 3C2MSi6O12O6-x(OH) x.nH2O, with species-defining M = Zr, Ti, Fe3+, Ca; C = Ca, Mn2+, Na, □ A = Na, Ca; B = Na, □ 0 ≤ x ≤ 6; n = 0-1. Their structures are based upon a heteropolyhedral framework consisting of rings of Si-centred tetrahedra and M-centred octahedra forming a 3D system of channels that host A, B, and C cations. The structures can be also considered as based upon pseudocubic modules centred at the midpoint of the Si tetrahedral ring. The M, A, and B cations are located at the borders of the module, whereas C cations are inside the module. The modules are stacked in three different arrangements in LGM allowing distinction of three subgroups: (1) zirsinalite-lovozerite subgroup (includes cation-saturated combeite, kapustinite, kazakovite and zirsinalite, and cation-deficient litvinskite, lovozerite and tisinalite), (2) koashvite subgroup (incl. koashvite) and (3) imandrite subgroup (incl. imandrite). The nature of cation-deficient LGM is discussed. The calculation scheme for empirical formulae of LGM and the criteria of definition of a mineral species (end-members) in the group are given.
KW - Combeite
KW - Crystal structure
KW - Cyclosilicate
KW - Imandrite
KW - Kapustinite
KW - Kazakovite
KW - Koashvite
KW - Litvinskite
KW - Lovozerite
KW - Lovozerite group
KW - Nomenclature of minerals
KW - Tisinalite
KW - Zirsinalite
UR - http://www.scopus.com/inward/record.url?scp=70449417633&partnerID=8YFLogxK
U2 - 10.1127/0935-1221/2009/0021-1957
DO - 10.1127/0935-1221/2009/0021-1957
M3 - Article
AN - SCOPUS:70449417633
VL - 21
SP - 1061
EP - 1071
JO - European Journal of Mineralogy
JF - European Journal of Mineralogy
SN - 0935-1221
IS - 5
ER -
ID: 9131233