- PII
- S26584352S0869605525020048-1
- DOI
- 10.7868/S2658435225020048
- Publication type
- Article
- Status
- Published
- Authors
- Volume/ Edition
- Volume 154 / Issue number 2
- Pages
- 75-87
- Abstract
- The new natural ZnAl-Cl layered double hydroxide (LDH) has been discovered among products of the supergene alteration of sphalerite-rich ores at the Hilarion mine, Lavrion District, Attiki Prefecture, Greece. It forms intergrowth with verminandite-like LDH and unidentified mineral phases. The chemical composition is (wt %, electron microprobe, HO content is calculated by stoichiometry): ZnO 51.89, AlO 16.09, AsO 1.83, Cl 10.08, HO 22.87, –O=Cl –2.28, total 100.50. The empirical formula calculated on the basis of the sum of all metal atoms equal to 3 apfu is ZnAl(OH)Cl(AsO)×HO. Associated minerals are aluminoceladonite (phengite), quartz, calcite, smithsonite, adamite, insufficiently studied LDHs, and goethite. The new natural ZnAl-Cl LDH occurs as aggregates of split platy crystals up to 70 μm across and up to 10 μm thick. It has Mohs hardness about 2, mica-like cleavage on (001) and malleable tenacity. It is white with pearly lustre. The ZnAl-Cl LDH crystallizes in space group R-3m, the unit-cell parameters are: a = 3.073(4), c = 23.14(3) Å, V = 189.16(3) Å. The strongest lines of the powder X-ray diffraction pattern [d, Å (I, %) (hkl)] are: 7.71 (100) (003), 3.857 (52) (006), 2.594 (29) (012), 2.307 (40) (015), 1.9585 (11) (018). The calculated density is 2.78 g·cm. The natural ZnAl-Cl LDH is optically uniaxial (+); w = 1.576(3), Nmax = 1.592(3). Chemically, the studied new natural LDH is a Zn-analogue of chlormagaluminite that explains similarities in their infrared spectra. The closest structural analogue is 3R polytype of iowatte that is also a chloride LDH, while chlormagaluminite is known as 2H polytype only.
- Keywords
- слоистый двойной гидроксид цинк надгруппа гидроталькита айоваит хлормагалюминит заккагнаит Лаврион Греция
- Date of publication
- 09.03.2026
- Year of publication
- 2026
- Number of purchasers
- 0
- Views
- 5
References
- 1. Бритвин С. Н., Доливо-Добровольский Д.В., Кржижановская М. Г. Программный пакет для обработки рентгеновских порошковых данных, полученных с цилиндрического детектора дифрактометра Rigaku RAXIS Rapid II // Записки РМО. 2017. Т. 146. № 3. С. 104—107. @@ Britvin S. N., Dolivo-Dobrovolsky D.V., Krzhizhanovskaya M. G. Software for proceedings the X-ray powder diffraction data obtained from the curved image plate detector of Rigaku RAXIS Rapid II diffractometer. Zapiski RMO (Proc. Russian Miner. Soc.). 2017. Vol. 146. N 3. P. 104—107 (in Russian).
- 2. Житова Е. С., Михайленко Д. С., Пеков И. В., Корсаков А. В., Золотарев А. А. Айоваит из кимберлитовой трубки Удачная (Якутия): кристаллохимия и посткристаллизационные преобразования // Доклады Российской академии наук. Науки о Земле. 2024. Т. 515. № 7. С. 114—124. @@ Zhitova E. S., Mikhailenko D. S., Pekov I. V., Korsakov A. V., Zolotarev A. A. Iowaite from the Udachnaya kimberlite pipe, Yakutia: Crystal chemistry and postcrystallization transformations. Doklady Earth Sci. 2024. Vol. 517. P. 1190—1198.
- 3. Житова Е. С., Кривовичев С. В., Пеков И. В., Золотарев А. А. Минералы группы гидроталькита: кристаллохимия и новый взгляд на «старые» минералы // Кристаллография. 2025. В печати. @@ Zhitova E. S., Krivovichev S. V., Pekov I. V., Zolotarev A. A. Hydrotalcite group minerals: crystal chemistry and a new look at “old” minerals. Crystallography Reports. 2025, in press.
- 4. Кашаев А. А., Феоктистов Г. Д., Петрова С. В. Хлормагалюминит-(Mg, Fe2+)4A12(OH)12(Cl,1/2СO3)2·2Н2O — новый минерал из группы манассеита-шегренита // Записки ВМО. 1982. Т. 111. № 1. С. 121—127. @@ Kashaev A. A., Feoktistov G. D., Petrova S. V. Chlormagaluminite, (Mg, Fe2+)4Al2(OH)12(Cl,1/2CO3)2(H2O)2, a new mineral of the manasseite-sjögrenite group. Zapiski RMO (Proc. Russian Miner. Soc.). 1982. Vol. 111. N 1. P. 121—127 (in Russian).
- 5. Феоктистов Г. Д., Иванов С. И., Кашаев А. А., Ключанский Л. Н., Таскина Н. Г., Ущаповская З. Ф. О находке хлор-манассеита в СССР // Записки ВМО. 1978. Т. 107. № 3. С. 321—325. @@ Feoktistov G. D., Ivanov S. I., Kashaev A. A., Klyuchnskii L. N., Taskina N. G., Ushchapovskaya Z. F. Occurrence of chlormanasseite in the USSR. International Geology Review. 1979. Vol. 21. P. 1229—1232.
- 6. Kuhn Th., Poellmann H. University of Halle, Dept. of Mineralogy and Geochemistry, Germany. ICDD Grant-in-Aid, 2005.
- 7. Lozano R. P., Rossi C., La Iglesia Á., Matesanz E. Zaccagnaite‑3R, a new Zn-Al hydrotalcite polytype from El Soplao cave (Cantabria, Spain). Amer. Miner. 2012. Vol. 97. P. 513—523.
- 8. Merlino S., Orlandi P. Carraraite and zaccagnaite, two new minerals from the Carrara marble quarries: their chemical compositions, physical properties, and structural features. Amer. Miner. 2001. Vol. 86. P. 1293—1301.
- 9. Mills S. J., Christy A. G., Génin J. M., Kameda T., Colombo F. Nomenclature of the hydrotalcite supergroup: natural layered double hydroxides. Miner. Mag. 2012. Vol. 76. N 5. P. 1289—1336.
- 10. Momma K., Izumi F. VESTA 3 for three-dimensional visualization of crystal, volumetric and morphology data. J. Appl. Crystall. 2011. Vol. 44. N 6. P. 1272—1276.
- 11. Rius J., Allmann R. The superstructure of the double layer mineral wermlandite (Mg7(Al0.57, Fe(3+)0.43)2(OH)18)2+((Ca0.6, Mg0.4)(SO4)2(H2O)12)2–. Zeitschrift für Kristallographie. 1984. Vol. 168. P. 133—144.
- 12. Rives V. Layered double hydroxides: present and future. Nova Publishers, 2001.
- 13. Zhitova E. S., Chukanov N. V., Pekov I. V., Zolotarev A. A., Shilovskikh V. V., Bocharov V. N. Crystal chemistry of iowaite, Mg6FeIII2(OH)16Cl2×4H2O, a natural layered double hydroxide. Applied Clay Science. 2023. Vol. 243. AN. 107070.
- 14. Zhitova E. S., Chukanov N. V., Jonsson E., Pekov I. V., Belakovskiy D. I., Vigasina M. F., Zubkova N. V., Van K. V., Britvin S. N. Erssonite, CaMg7Fe3+2(OH)18(SO4)2⋅12H2O, a new hydrotalcite-supergroup mineral from Långban, Sweden. Miner. Mag. 2021. Vol. 85. N 5. P. 817—826.
- 15. Zhitova E. S., Krivovichev S. V., Pekov I. V., Yapaskurt V. O. Crystal chemistry of chlormagaluminite, Mg4Al2(OH)12Cl2(H2O)2, a natural layered double hydroxide. Minerals. 2019. Vol. 9. N 4. Paper 221.
