- PII
- S2658435225060028-1
- DOI
- 10.7868/S2658435225060028
- Publication type
- Article
- Status
- Published
- Authors
- Volume/ Edition
- Volume 154 / Issue number 6
- Pages
- 27-39
- Abstract
- A new mineral masaitisite, ideally KCuO(SeO)Cl, was found in high-temperature sublimes of the active fumarole Yadovitaya at the Second scoria cone of the Northern Breakthrough of the Great Tolbachik Fissure Eruption, Tolbachik volcano, Kamchatka, Russia. The mineral is associated with euchlorine, alumokly-uchevskite, langbeinite, cupromolybdite, pseudoloyonsite, yaroshevskite, lyonsite, hematite, and palmierite. Masaitisite occurs as prismatic, tabular or lamellar crystals up to 30μm long, up to 20μm wide, and up to 5μm thick. The crystals are combined in aggregates up to 0.2mm overgrowing euchlorine crusts. Masaitisite is transparent, bright yellowish-green, with strong vitreous lustre. It is brittle, cleavage was not observed. D = 4.01g / cm. In reflected light, masaitisite is gray, bireflectance is weak, internal reflections are weak light green; the mineral is distinctly anisotropic, from brownish-gray to dark brownish-gray. The reflectance values [R - R,% (λ, nm)] are: 8.1 - 10.9 (470), 9.8 - 11.3 (546), 9.2 - 10.4 (589), 7.9 - 9.8 (650). The chemical composition (electron microprobe data, wt. % ) is: NaO 0.12, KO 5.04, CuO 52.42, ZnO 0.19, SeO 30.21, SO 0.05, Cl 14.19, Br 0.80, - O = (Cl,Br) 3.29 total 99.73. The empirical formula calculated on the basis of 11 O + Cl + Br apfu is (KNa)(CuZn)SeOClBr. Masaitisite is orthorhombic, space group Pnma, a = 18.154(5), b = 6.451(2), c = 10.567(3) Å, V = 1237(1) Å, and Z = 4. The strongest reflections of the powder X- ray diffraction pattern [d,Å(I,%) (hkl)] are: 9.03 (100) (200); 5.50 (55) (011); 5.27 (88) (002, 301); 3.276 (52) (203); 3.227 (71) (020); 2.633 (63) (004, 222, 420); 2.526 (46) (701); 2.347 (43) (513, 422, 711). Masaitisite is a K analogue of ilinskite NaCuO(SeO)Cl and a natural analogue of synthetic KCuO(SeO)Cl. The mineral is named in honour of the prominent Russian geologist and petrologist Viktor Liudvigovich Masaitis (1927-2019).
- Keywords
- масайтисит новый минерал калиево-медный селенит хлороселенит ильинскит фумарольные эксгаляции вулкан Толбачик Камчатка
- Date of publication
- 16.10.2025
- Year of publication
- 2025
- Number of purchasers
- 0
- Views
- 8
References
- 1. Britvin S. N., Dolivo- Dobrovolsky D. V., Krzhizhanovskaya M. G. Software for processing 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. Charykova M. V., Krivovichev V. G. Thermodynamics of environmentally important natural and synthetic phases containing selenium. In: Biogenic—Abiogenic Interactions in Natural and Anthropogenic Systems. Springer International Publishing Switzerland, Cham, 2016. P. 145–155.
- 3. Fedotov S. A., Markhinin Y. K., eds. The Great Tolbachik Fissure Eruption. New York, Cambridge Univ. Press, 1983. 341 p.
- 4. Gemmi M., Campostrini I., Demartin F., Gorelik T. E., Gramaccioli C. M. Structure of the new mineral sarrabusite, Pb5Cu(SeO3)4Cl4, solved by manual electron-diffraction tomography. Acta Cryst. 2012. Vol. B68. P. 15–23.
- 5. Kovrugin V. M., Siidra O. I., Colmont M., Mentré O., Krivovichev S. V. Emulating exhalative chemistry: synthesis and structural characterization of ilinskite, Na[Cu5O2](SeO3)2Cl3, and its K- analogue. Miner. Petrol. 2015. Vol. 109. P. 421–430.
- 6. Krivovichev S. V., Vergasova L. P., Starova G. L., Filatov S. K., Britvin S. N., Roberts A. C., Steele I. M. Burnsite, KCdCu5O2(SeO3)2Cl3, a new mineral species from the Tolbachik Volcano, Kamchatka Peninsula, Russia. Canad. Miner. 2002. Vol. 40. P. 1171–1175.
- 7. Krivovichev S. V., Filatov S. K., Vergasova L. P. The crystal structure of ilinskite, NaCu5O2(SeO3)2Cl3, and review of mixed-ligand CuOmCln coordination geometries in minerals and inorganic compounds. Miner. Petrol. 2013a. Vol. 107. P. 235–242.
- 8. Krivovichev S. V., Mentre O., Siidra O. I., Colmont M., Filatov S. K. Anion-centered tetrahedra in inorganic compounds. Chemical Reviews. 2013b. Vol. 113. P. 6459–6535.
- 9. Nakamoto K. Infrared and Raman Spectra of Inorganic and Coordination Compounds. New York: John Wiley & Sons, 1986. 432 p.
- 10. Pekov I. V., Zubkova N. V., Yapaskurt V. O., Britvin S. N., Chukanov N. V., Lykova I. S., Sidorov E. G., Pushcharovsky D. Yu. Zincomenite, ZnSeO3, a new mineral from the Tolbachik volcano, Kamchatka, Russia. Eur. J. Miner. 2016. Vol. 28. P. 997-1004.
- 11. Pekov I. V., Zubkova N. V., Pushcharovsky D. Yu. Copper minerals from volcanic exhalations - a unique family of natural compounds: Crystal chemical review. Acta Cryst. 2018. Vol. B74. P. 502-518.
- 12. Pekov I. V., Agakhanov A. A., Zubkova N. V., Koshlyakova N. N., Shchipalkina N. V., Sandalov F. D., Yapaskurt V. O., Turchkova A. G., Sidorov E. G. Oxidizing-type fumaroles of the Tolbachik Volcano, a mineralogical and geochemical unique. Russian Geol. Geophys. 2020. Vol. 61. P. 675-688.
- 13. Pring A., Gatehouse B. M., Birch W. D. Francisite, Cu3BiO2(SeO3)2Cl, a new mineral from Iron Monarch, South Australia: Description and crystal structure. Amer. Miner. 1990. Vol. 75. P. 1421-1425.
- 14. Shuvalov R. R., Vergasova L. P., Semenova T. F., Filatov S. K., Krivovichev S. V., Siidra O. I., Rudashevsky N. S. Prewittite, KPb1.5Cu6Zn(SeO3)2O2Cl10, a new mineral from Tolbachik fumaroles, Kamchatka Peninsula, Russia: description and crystal structure. Amer. Miner. 2013. Vol. 98. P. 463-469.
- 15. Vergasova L. P., Filatov S. K. A study of volcanogenic exhalation mineralization. J. Volcanol. Seismol. 2016. Vol. 10. N 2. P. 71-85.
- 16. Vergasova L. P., Filatov S. K., Semenova T. F., Filosofova T. M. Sofite, Zn2(SeO3)Cl2, a new mineral of volcanic exhalations. Zapiski VMO (Proc. Russian Miner. Soc.). 1989. Vol. 118. N 1. P. 65-69 (in Russian).
- 17. Vergasova L. P., Semenova T. F., Shuvalov R. R., Filatov S. K., Ananiev V. V. Ilinskite, NaCu2O2(SeO3)2Cl3 - a new mineral of volcanic exhalations. Doklady Earth. Sci. 1997. Vol. 353. N 5. P. 641-644 (in Russian).
- 18. Vergasova L. P., Semenova T. F., Filatov S. K., Krivovichev S. V., Shuvalov R. R., Ananiev V. V. Georgbokite Cu5O2(SeO3)2Cl2 - a new mineral from volcanic sublimes. Doklady Earth. Sci. 1999a. Vol. 364. N 4. P. 527-531 (in Russian).
- 19. Vergasova L. P., Krivovichev S. V., Semenova T. F., Filatov S. K., Ananiev V. V. Chloromenite, Cu5O2(SeO3)4Cl6, a new mineral from the Tolbachik volcano, Kamchatka, Russia. Eur. J. Miner. 1999b. Vol. 11. P. 119-123.
- 20. Vergasova L. P., Krivovichev S. V., Britvin S. N., Filatov S. K., Burns P. C., Ananiev V. V. Allochalcoselite, PbCu+Cu2+O2(SeO3)2Cl5 - a new mineral from volcanic exhalations (Kamchatka Peninsula, Russia). Zapiski RMO (Proc. Russian Miner. Soc.). 2005. Vol. 134. N 3. P. 70-73 (in Russian).
- 21. Vergasova L. P., Krivovichev S. V., Filatov S. K., Britvin S. N., Burns P. C., Ananiev V. V. Parageorgbokite, β-Cu5O2(SeO3)2Cl2 - a new mineral from volcanic exhalations (Kamchatka Peninsula, Russia). Zapiski RMO (Proc. Russian Miner. Soc.). 2006. Vol. 135. N 4. P. 24-28 (in Russian, English Translation: Geol. Ore Deposits. 2007. Vol. 49. N 7. P. 518-521).
- 22. Vergasova L. P., Semenova T. F., Krivovichev S. V., Filatov S. K., Zolotarev A. A. Jr., Ananiev V. V. Nicksobolevite, Cu7(SeO3)3O2Cl6, a new complex copper oxoselenite chloride from Tolbachik fumaroles, Kamchatka peninsula, Russia. Eur. J. Miner. 2014. Vol. 26. P. 439-449.
