Research output: Contribution to journal › Article › peer-review
Redefinition of satimolite. / Pekov, Igor V.; Zubkova, Natalia V.; Ksenofontov, Dmitry A.; Chukanov, Nikita V.; Yapaskurt, Vasiliy O.; Korotchenkova, Oksana V.; Chaikovskiy, Ilya I.; Bocharov, Vladimir M.; Britvin, Sergey N.; Pushcharovsky, Dmitry Yu.
In: Mineralogical Magazine, Vol. 82, No. 5, 01.10.2018, p. 1033-1047.Research output: Contribution to journal › Article › peer-review
}
TY - JOUR
T1 - Redefinition of satimolite
AU - Pekov, Igor V.
AU - Zubkova, Natalia V.
AU - Ksenofontov, Dmitry A.
AU - Chukanov, Nikita V.
AU - Yapaskurt, Vasiliy O.
AU - Korotchenkova, Oksana V.
AU - Chaikovskiy, Ilya I.
AU - Bocharov, Vladimir M.
AU - Britvin, Sergey N.
AU - Pushcharovsky, Dmitry Yu
PY - 2018/10/1
Y1 - 2018/10/1
N2 - The borate mineral satimolite, which was first described in 1969 and remained poorly-studied until now, has been re-investigated (electron microprobe analysis, single-crystal and powder X-ray diffraction studies, crystal-structure determination, infrared spectroscopy) and redefined based on the novel data obtained for the holotype material from the Satimola salt dome and a recently found sample from the Chelkar salt dome, both in North Caspian Region, Western Kazakhstan. The revised idealized formula of satimolite is KNa2(Al5Mg2)[B12O18(OH)12](OH)6Cl4·4H2O (Z = 3). The mineral is trigonal, space group R3m, unit-cell parameters are: a = 15.1431(8), c = 14.4558(14) A and V = 2870.8(4) A3 (Satimola) and a = 15.1406(4), c = 14.3794(9) A and V = 2854.7(2) A3 (Chelkar). The crystal system and unit-cell parameters are quite different from those reported previously. The crystal structure of the sample from Chelkar was solved based on single-crystal data (direct methods, R = 0.0814) and the structure of the holotype from Satimola was refined on a powder sample by the Rietveld method (Rp = 0.0563, Rwp = 0.0761 and Rall = 0.0667). The structure of satimolite is unique for minerals. It contains 12-membered borate rings [B12O18(OH)12] in which BO3 triangles alternate with BO2(OH)2 tetrahedra sharing common vertices, and octahedral clusters [M7O6(OH)18] with M = Al5Mg2 in the ideal case, with sharing of corners between rings and clusters to form a three-dimensional heteropolyhedral framework. Each borate ring is connected with six octahedral clusters: three under the ring and three over the ring. Large ellipsoidal cages in the framework host Na and K cations, Cl anions and H2O molecules.
AB - The borate mineral satimolite, which was first described in 1969 and remained poorly-studied until now, has been re-investigated (electron microprobe analysis, single-crystal and powder X-ray diffraction studies, crystal-structure determination, infrared spectroscopy) and redefined based on the novel data obtained for the holotype material from the Satimola salt dome and a recently found sample from the Chelkar salt dome, both in North Caspian Region, Western Kazakhstan. The revised idealized formula of satimolite is KNa2(Al5Mg2)[B12O18(OH)12](OH)6Cl4·4H2O (Z = 3). The mineral is trigonal, space group R3m, unit-cell parameters are: a = 15.1431(8), c = 14.4558(14) A and V = 2870.8(4) A3 (Satimola) and a = 15.1406(4), c = 14.3794(9) A and V = 2854.7(2) A3 (Chelkar). The crystal system and unit-cell parameters are quite different from those reported previously. The crystal structure of the sample from Chelkar was solved based on single-crystal data (direct methods, R = 0.0814) and the structure of the holotype from Satimola was refined on a powder sample by the Rietveld method (Rp = 0.0563, Rwp = 0.0761 and Rall = 0.0667). The structure of satimolite is unique for minerals. It contains 12-membered borate rings [B12O18(OH)12] in which BO3 triangles alternate with BO2(OH)2 tetrahedra sharing common vertices, and octahedral clusters [M7O6(OH)18] with M = Al5Mg2 in the ideal case, with sharing of corners between rings and clusters to form a three-dimensional heteropolyhedral framework. Each borate ring is connected with six octahedral clusters: three under the ring and three over the ring. Large ellipsoidal cages in the framework host Na and K cations, Cl anions and H2O molecules.
KW - aluminium chloroborate
KW - borate mineral
KW - Chelkar salt dome
KW - crystal structure
KW - evaporite deposit
KW - Satimola salt dome
KW - satimolite
KW - Western Kazakhstan
UR - http://www.scopus.com/inward/record.url?scp=85060932817&partnerID=8YFLogxK
U2 - 10.1180/minmag.2017.081.081
DO - 10.1180/minmag.2017.081.081
M3 - Article
AN - SCOPUS:85060932817
VL - 82
SP - 1033
EP - 1047
JO - Mineralogical Magazine
JF - Mineralogical Magazine
SN - 0026-461X
IS - 5
ER -
ID: 39019736