Research output: Contribution to journal › Article › peer-review
Kaznakhtite, Ni 6Co 2 3+(CO 3)(OH) 16·4H 2O, a new natural layered double hydroxide, the member of the hydrotalcite supergroup. / Kasatkin, Anatoly V.; Britvin, Sergey N.; Krzhizhanovskaya, Maria G.; Chukanov, Nikita V.; Škoda, Radek; Göttlicher, Jörg; Belakovskiy, Dmitry I.; Pekov, Igor V.; Levitskiy, Victor V.
In: Mineralogical Magazine, Vol. 86, No. 5, 21.10.2022, p. 841 - 848.Research output: Contribution to journal › Article › peer-review
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TY - JOUR
T1 - Kaznakhtite, Ni 6Co 2 3+(CO 3)(OH) 16·4H 2O, a new natural layered double hydroxide, the member of the hydrotalcite supergroup
AU - Kasatkin, Anatoly V.
AU - Britvin, Sergey N.
AU - Krzhizhanovskaya, Maria G.
AU - Chukanov, Nikita V.
AU - Škoda, Radek
AU - Göttlicher, Jörg
AU - Belakovskiy, Dmitry I.
AU - Pekov, Igor V.
AU - Levitskiy, Victor V.
N1 - Publisher Copyright: Copyright © 2022 The Author(s).
PY - 2022/10/21
Y1 - 2022/10/21
N2 - Kaznakhtite, ideally Ni6Co23+(CO3)(OH)16·4H2O, is a new member of the hydrotalcite group within the hydrotalcite supergroup. The mineral was discovered at the Kaznakhtinskiy ultrabasic massif, Altai Republic, SW Siberia, Russia. It occurs as powdery aggregates forming flattened lenses up to 1.5 × 0.5 cm and veinlets up to 1 cm long and up to 1 mm thick in aggregates of chrysotile, lizardite, stichtite and dolomite. Other associated minerals include brucite, chromite, heazlewoodite, manganochromite, magnetite and magnesioferrite. Kaznakhtite aggregates are composed of tiny platy grains up to 0.01 mm across. Kaznakhtite is light green and translucent in aggregates. It has an earthy lustre and white streak. Cleavage is micaceous on {001}. Dcalc = 2.864 g cm-3. The mineral is optically uniaxial (-) with ϵ = 1.657(3) and ω = 1.676(3), and weakly pleochroic in greenish hues, ω > ϵ. Chemical composition (wt.%, electron microprobe, Co valence state determined by XANES spectroscopy, CO2 and H2O calculated by stoichiometry) is: MgO 2.15, NiO 47.40, ZnO 0.22, Al2O3 0.16, Cr2O3 0.98, Co2O3 17.42, Cl 0.63, CO2 5.05, H2O 24.60, -O=Cl -0.14, total 98.47. The empirical formula calculated based on the sum of all metal cations = 8 apfu is (Ni5.54Mg0.47Zn0.02)Σ6.03(Co3+1.83Cr0.11Al0.03)Σ1.97C1.00O2.99(OH)15.84Cl0.16·4H2O. Infrared spectroscopy confirmed the presence of CO32- anions, OH- groups and H2O molecules. The crystal structure was refined by the Rietveld method with RB = 0.19%. Kaznakhtite is trigonal, space group R¯3m, a = 3.0515 (3), c = 23.180 (3) Å, V = 186.93 (4) Å3 and Z = 3/8. The strongest lines of the powder X-ray diffraction pattern [d, Å (I, %) (hkl)] are: 7.72 (100) (003); 3.863 (24) (006); 2.630 (4) (101); 2.576 (10) (012); 2.294 (6) (015); 1.950 (4) (018); 1.526 (4) (110); and 1.497 (4) (113). Kaznakhtite is a Co3+ analogue of reevesite, Ni6Fe23+(CO3)(OH)16·4H2O. The mineral is named after its type locality.
AB - Kaznakhtite, ideally Ni6Co23+(CO3)(OH)16·4H2O, is a new member of the hydrotalcite group within the hydrotalcite supergroup. The mineral was discovered at the Kaznakhtinskiy ultrabasic massif, Altai Republic, SW Siberia, Russia. It occurs as powdery aggregates forming flattened lenses up to 1.5 × 0.5 cm and veinlets up to 1 cm long and up to 1 mm thick in aggregates of chrysotile, lizardite, stichtite and dolomite. Other associated minerals include brucite, chromite, heazlewoodite, manganochromite, magnetite and magnesioferrite. Kaznakhtite aggregates are composed of tiny platy grains up to 0.01 mm across. Kaznakhtite is light green and translucent in aggregates. It has an earthy lustre and white streak. Cleavage is micaceous on {001}. Dcalc = 2.864 g cm-3. The mineral is optically uniaxial (-) with ϵ = 1.657(3) and ω = 1.676(3), and weakly pleochroic in greenish hues, ω > ϵ. Chemical composition (wt.%, electron microprobe, Co valence state determined by XANES spectroscopy, CO2 and H2O calculated by stoichiometry) is: MgO 2.15, NiO 47.40, ZnO 0.22, Al2O3 0.16, Cr2O3 0.98, Co2O3 17.42, Cl 0.63, CO2 5.05, H2O 24.60, -O=Cl -0.14, total 98.47. The empirical formula calculated based on the sum of all metal cations = 8 apfu is (Ni5.54Mg0.47Zn0.02)Σ6.03(Co3+1.83Cr0.11Al0.03)Σ1.97C1.00O2.99(OH)15.84Cl0.16·4H2O. Infrared spectroscopy confirmed the presence of CO32- anions, OH- groups and H2O molecules. The crystal structure was refined by the Rietveld method with RB = 0.19%. Kaznakhtite is trigonal, space group R¯3m, a = 3.0515 (3), c = 23.180 (3) Å, V = 186.93 (4) Å3 and Z = 3/8. The strongest lines of the powder X-ray diffraction pattern [d, Å (I, %) (hkl)] are: 7.72 (100) (003); 3.863 (24) (006); 2.630 (4) (101); 2.576 (10) (012); 2.294 (6) (015); 1.950 (4) (018); 1.526 (4) (110); and 1.497 (4) (113). Kaznakhtite is a Co3+ analogue of reevesite, Ni6Fe23+(CO3)(OH)16·4H2O. The mineral is named after its type locality.
KW - Altai Republic
KW - crystal structure
KW - hydrotalcite supergroup
KW - IR spectroscopy
KW - Kaznakhtinskiy ultrabasic massif
KW - kaznakhtite
KW - layered double hydroxide
KW - new mineral
KW - XANES
UR - http://www.scopus.com/inward/record.url?scp=85135499498&partnerID=8YFLogxK
UR - https://www.mendeley.com/catalogue/84c28550-bb97-3e55-b034-d63151c03af4/
U2 - 10.1180/mgm.2022.65
DO - 10.1180/mgm.2022.65
M3 - Article
AN - SCOPUS:85135499498
VL - 86
SP - 841
EP - 848
JO - Mineralogical Magazine
JF - Mineralogical Magazine
SN - 0026-461X
IS - 5
ER -
ID: 98735761