Marinaite, Cu <sub>2</sub> Fe <sup>3+</sup> O <sub>2</sub> (BO <sub>3</sub> ), a new ludwigite-group mineral from Tolbachik volcano, Kamchatka, Russia.
Marinaite, ideally Cu 2 Fe 3+ O 2 (BO 3 ), a new mineral, was found in a high-temperature (400-600C) crack on the cooling lava field of the 2012-2013 fissure eruption at Tolbachik volcano, Kamchatka, Russia.The associated minerals are belomarinaite, tenorite, hematite, anglesite and gold.Marinaite forms prismatic, tabular, lamellar or acicular crystals up to 0.06 x 0.06 x 0.3 mm or aggregates of these forms up to 3 mm across.The mineral has a brown to black colour and submetallic lustre.Under the microscope in reflected light marinaite is grey with reddish-brown internal reflections.D calc .=5.026 g/cm 3 .Electron microprobe analyses yielded (wt.%) 62.15 CuO, 16.71 Fe 2 O 3 , 5.11 Al 2 O 3 , 3.14 TiO 2 , 0.16 SiO 2 , 12.84 B 2 O 3 , total 100.11wt.%.The empirical formula calculated based on 5 O apfu is Cu 2.07 Fe 0.56 Al 0.27 Ti 0.10 Si 0.01 B 0.98 O 5 .Marinaite is monoclinic, space group P2 1 /c, unit-cell parameters are: a = 3.12750(18), b = 11.9690(8),c = 9.4657(5) , = 97.568(6),V = 351.24(4) 3 and Z=4.The strongest lines of the powder XRD pattern [d in (I)(hkl)] are: 5.
Authors
- Ilya Chaplygin (ORCID: https://orcid.org/0000-0001-6762-6727)
- Natalia V. Zubkova (ORCID: https://orcid.org/0000-0002-1346-7545)
- И. Г. Грибоедова
- Marina A. Yudovskaya (ORCID: https://orcid.org/0000-0002-3432-0016)
- Dmitry I. Belakovskiy (ORCID: https://orcid.org/0000-0002-2098-3396)
- Sergey N. Britvin (ORCID: https://orcid.org/0000-0003-3183-7594)
- Д. А. Ксенофонтов (ORCID: https://orcid.org/0000-0002-2408-0776)
- М. Ф. Вигасина (ORCID: https://orcid.org/0000-0002-1494-469X)
- В. А. Рассулов (ORCID: https://orcid.org/0000-0001-6235-0936)
- Н. Н. Кононкова
- Dmitry Yu. Pushcharovsky (ORCID: https://orcid.org/0000-0003-3851-0244)
- Igor V. Pekov
Institutions
- St Petersburg University (RU)
- Lomonosov Moscow State University (RU)
- Institute of Geology of Ore Deposits Petrography Mineralogy and Geochemistry (RU)
- All-Russian Scientific-Research Institute Of Mineral Resources named after N.M. Fedorovsky (RU)
- V.I. Vernadsky Institute of Geochemistry and Analytical Chemistry (RU)
- Russian Academy of Natural Sciences (RU)
Publication Details
- Journal
- Mineralogical Magazine
- Published
- 2025-11-24
- DOI
- https://doi.org/10.1180/mgm.2025.10179
- Primary Topic
- Crystal Structures and Properties
- Type
- article
- Field-Weighted Citation Impact
- 0.00
Funders
- Far East Branch, Russian Academy of Sciences