IMA no. 2024-085

• Arzamastsevite

• K₆Al₅Si₆O₂₀(OH)₄Cl

• Azm

• Parguaiv Mountain, Lovozero alkaline massif, Kola Peninsula, Russia (67°47^′22.4^′′ N, 34°35^′10^′′ E)

• Julia A. Mikhailova^*, Yakov A. Pakhomovsky, Ekaterina A. Selivanova, Andrey A. Zolotarev, Sergey M. Aksenov, and Vladimir N. Bocharov

• ^* E-mail: j.mikhailova@ksc.ru

• Chemically and structurally related to kalborsite

• Tetragonal: $I\stackrel{\mathrm{‾}}{\mathrm{4}}$2m; structure determined

• a= 9.8280(5), c= 13.134(1) Å

• 6.947(24), 3.478(35), 3.286(26), 3.110(44), 3.075(100), 2.971(84), 2.813(73), 2.732(28),

• Type material is deposited in the collections of the Geological and the Mineralogical Museum of the Geological Institute, Kola Science Centre of the Russian Academy of Sciences, 14 Fersman Street, 184209 Apatity, Russia, catalogue number GIM 7986

• How to cite: Mikhailova, J. A., Pakhomovsky, Y. A., Selivanova, E. A., Zolotarev, A. A., Aksenov, S. M., and Bocharov, V. N.: Arzamastsevite, IMA 2024-085, in: CNMNC Newsletter 85, Eur. J. Mineral., 37, https://doi.org/10.5194/ejm-37-337-2025, 2025.

IMA no. 2024-094

• Chenzhangruite

• MnFe²⁺Te${}_{\mathrm{4}}^{\mathrm{4}+}$O₁₀

• Czr

• Moctezuma mine, Moctezuma, Sonora, Mexico (29°48^′ N, 109°40^′ W)

• Hexiong Yang^*, Guang Fan, Xiangping Gu, Brent Thorne, and Ronald B. Gibbs

• ^* E-mail: hyang@arizona.edu

• Denningite group

• Tetragonal: P4₂/nbc; structure determined

• a= 8.7576(4), c= 12.9575(6) Å

• 6.219(40), 4.377(91), 3.356(100), 3.101(77), 2.774(17), 2.605(36), 2.020(68), 1.517(27)

• Type material is deposited in the collections of the University of Arizona Alfie Norville Gem and Mineral Museum, 115 N Church Ave Ste 121, Tucson, AZ 85701, USA, catalogue no. 22739 (holotype), and the RRUFF Project, deposition no. R240011 (cotype)

• How to cite: Yang, H., Fan, G., Gu, X., Thorne, B., and Gibbs, R. B.: Chenzhangruite, IMA 2024-094, in: CNMNC Newsletter 85, Eur. J. Mineral., 37, https://doi.org/10.5194/ejm-37-337-2025, 2025.

IMA no. 2024-095

• Barkovite

• Ni_1.5Sn

• Bark

• Mt. Partomchorr, Khibiny alkaline complex, Kola Peninsula, Russia (67°49^′46.5^′′ N, 33°38^′56.6^′′ E)

• Oleg S. Vereshchagin^*, Sergey N. Britvin, Anatoly V. Kasatkin, Larisa V. Kamaeva, Natalia S. Vlasenko, Olesya A. Sinichenko, Julia A. Mikhailova, and Igor V. Pekov

• ^* E-mail: oleg-vereschagin@yandex.ru

• Structurally related to nickeline

• Hexagonal: P6₃/mmc; structure determined

• a= 4.049(4), c= 5.124(4) Å

• 2.87(61), 2.53(27), 2.05(100), 1.64(12), 1.53(20), 1.44(18), 1.28(15), 1.17(25)

• Type material is deposited in the collections of the Fersman Mineralogical Museum, Russian Academy of Sciences, Leninsky Pr. 18-2, 119071 Moscow, Russia, registration number 6209/1

• How to cite: Vereshchagin, O. S., Britvin, S. N., Kasatkin, A. V., Kamaeva, L. V., Vlasenko, N. S., Sinichenko, O. A., Mikhailova, J. A., and Pekov, I. V.: Barkovite, IMA 2024-095, in: CNMNC Newsletter 85, Eur. J. Mineral., 37, https://doi.org/10.5194/ejm-37-337-2025, 2025.

IMA no. 2024-096

• Zavyalovite

• Ag₂TeS₃

• Zvv

• Boevskoe deposit, 35 km southwest of the town of Kamensk-Uralskiy, Kaslinskiy District, Chelyabinsk Oblast, Southern Urals, Russia (56°14^′44^′′ N, 61°22^′26^′′ E)

• Anatoly V. Kasatkin^*, Fabrizio Nestola, Anna Vymazalová, Filip Košek, Atali A. Agakhanov, and Alexey M. Kuznetsov

• ^* E-mail: anatoly.kasatkin@gmail.com

• Known synthetic analogue

• Monoclinic: Cc

• a= 6.8440(8), b= 11.515(1), c= 7.6529(7) Å, β= 114.47(1)°

• 3.495(73), 3.242(61), 3.017(57), 2.749(100), 2.163(22), 2.131(64), 1.941(21), 1.778(20)

• Type material is deposited in the collections of the Fersman Mineralogical Museum, Russian Academy of Sciences, Leninsky Pr. 18-2, 119071 Moscow, Russia, registration numbers 6214/1 (zavyalovite) and 6214/2 (synthetic Ag₂TeS₃)

• How to cite: Kasatkin, A. V., Nestola, F., Vymazalová, A., Košek, F., Agakhanov, A. A., and Kuznetsov, A. M.: Zavyalovite, IMA 2024-096, in: CNMNC Newsletter 85, Eur. J. Mineral., 37, https://doi.org/10.5194/ejm-37-337-2025, 2025.

IMA no. 2024-097

• Kenomicrolite

• □₂Ta₂[O₄(OH)₂]□

• Kmic

• Volta Grande pegmatite, Nazareno, Minas Gerais, Brazil (21°10^′08.6^′′ S, 44°36^′01.3^′′ W)

• Alice Taddei, Daniel Atencio, and Luca Bindi^*

• ^* E-mail: luca.bindi@unifi.it

• Pyrochlore supergroup

• Cubic: Fd$\stackrel{\mathrm{‾}}{\mathrm{3}}m$; structure determined

• a= 10.5911(6) Å

• 6.1(70), 3.18(40), 3.04(100), 2.637(28), 2.032(16), 1.866(51), 1.784(16), 1.593(40)

• Type material is deposited in the collections of the Museo di Storia Naturale, Università di Firenze, Via La Pira 4, 50121 Firenze, Italy, catalogue number MSN-MIN 3747-I

• How to cite: Taddei, A., Atencio, D., and Bindi, L.: Kenomicrolite, IMA 2024-097, in: CNMNC Newsletter 85, Eur. J. Mineral., 37, https://doi.org/10.5194/ejm-37-337-2025, 2025.

IMA no. 2024-098

• Wenqingite

• Pb₅(AsS₃)₂(Ge₂S₆)

• Wq

• Wusihe deposit, Hanyuan County, Sichuan Province, China (102°53^′23.0^′′ E, 29°16^′27.0^′′ N)

• Yumiao Meng, Ruizhong Hu, Yiping Yang, Xiaowen Huang, Guanghua Liu, and Xiangping Gu^*

• ^* E-mail: guxp2004@163.com

• New structure type

• Monoclinic: P2₁/c; structure determined

• a= 17.856(1), b= 10.8990(5), c= 10.9637(6) Å, β= 108.277(6)°

• 3.941(75), 3.895(100), 3.367(36), 3.181(36), 2.818(82), 2.544(73), 2.450(91), 1.978(45)

• Type material is deposited in the collections of the Geological Museum of China, No. 16, Yangrou Hutong, Xisi, Beijing 100031, People's Republic of China, catalogue number M1613x

• How to cite: Meng, Y., Hu, R., Yang, Y., Huang, X., Liu, G., and Gu, X.: Wenqingite, IMA 2024-098, in: CNMNC Newsletter 85, Eur. J. Mineral., 37, https://doi.org/10.5194/ejm-37-337-2025, 2025.

IMA no. 2022-048a

• Wolfsriedite

• Pb[(UO₂)₂(W⁶⁺Fe³⁺)O₇(OH)](H₂O)₃

• Wfr

• Clara mine, Oberwolfach, Schwarzwald (Black Forest), Baden-Württemberg, Germany (48°22^′46^′′ N, 8°13^′44^′′ E)

• Jakub Plášil^*, Uwe Kolitsch, Radek Škoda, Gwladys Steciuk, Anthony R. Kampf, Anatoly V. Kasatkin, and Jiří Čejka

• ^* E-mail: plasil@fzu.cz

• Chemically and structurally related to uranotungstite

• Monoclinic: P2₁/m; structure determined

• a= 6.3598(4), b= 7.4753(4), c= 14.080(2) Å, β= 98.699(9)°

• 13.96(20), 7.00(94), 4.645(28), 3.197(45), 3.025(100), 1.978(35), 1.793(25), 1.578(42)

• Cotype material is deposited in the mineralogical collections of the Fersman Mineralogical Museum, Russian Academy of Sciences, Leninsky Pr. 18-2, 119071 Moscow, Russia, registration number 6187/1, and the Natural History Museum of Los Angeles County, 900 Exposition Boulevard, Los Angeles, CA 90007, USA, catalogue number 76190

• How to cite: Plášil, J., Kolitsch, U., Škoda, R., Steciuk, G., Kampf, A. R., Kasatkin, A. V., and Čejka, J.: Wolfsriedite, IMA 2022-048a, in: CNMNC Newsletter 85, Eur. J. Mineral., 37, https://doi.org/10.5194/ejm-37-337-2025, 2025.

IMA no. 2025-001

• Akasakaite-(Ce)

• CaCe(Al₂Mn²⁺)(Si₂O₇)(SiO₄)O(OH)

• Ak-Ce

• Mogurazawa mine, Hishimachi, city of Kiryu, Gunma Prefecture, Japan (36°26^′23^′′ N, 139°22^′59^′′ E)

• Mariko Nagashima^*, Daisuke Nishio-Hamane, Masayuki Ohnishi, and Akira Harada

• ^* E-mail: nagashim@yamaguchi-u.ac.jp

• Epidote supergroup

• Monoclinic: P2₁/m; structure determined

• a= 8.8955(4), b= 5.7064(2), c= 10.1175(4) Å, β= 113.791(5)°

• 7.95(28), 5.10(31), 2.89(100), 2.70(67), 2.62(76), 2.13(45), 1.65(30), 1.43(28)

• Type material is deposited in the collections of the National Museum of Nature and Science, 4-1-1 Amakubo, Tsukuba, Ibaraki 305-0005, Japan, specimen number NSM-M53012

• How to cite: Nagashima, M., Nishio-Hamane, D., Ohnishi, M., and Harada, A.: Akasakaite-(Ce), IMA 2025-001, in: CNMNC Newsletter 85, Eur. J. Mineral., 37, https://doi.org/10.5194/ejm-37-337-2025, 2025.

IMA no. 2025-002

• Akasakaite-(La)

• CaLa(Al₂Mn²⁺)(Si₂O₇)(SiO₄)O(OH)

• Ak-La

• Mogurazawa mine, Hishimachi, city of Kiryu, Gunma Prefecture, Japan (36°26^′23^′′ N, 139°22^′59^′′ E)

• Mariko Nagashima^*, Daisuke Nishio-Hamane, Masayuki Ohnishi, and Akira Harada

• ^* E-mail: nagashim@yamaguchi-u.ac.jp

• Epidote supergroup

• Monoclinic: P2₁/m; structure determined

• a= 8.8848(4), b= 5.6938(2), c= 10.0998(4) Å, β= 113.668(5)°

• 9.24(24), 7.93(14), 4.96(29), 4.67(11), 3.76(12), 3.52(26), 2.89(100), 2.69(48)

• Type material is deposited in the collections of the National Museum of Nature and Science, 4-1-1 Amakubo, Tsukuba, Ibaraki 305-0005, Japan, specimen number NSM-M53013

• How to cite: Nagashima, M., Nishio-Hamane, D., Ohnishi, M., and Harada, A.: Akasakaite-(La), IMA 2025-002, in: CNMNC Newsletter 85, Eur. J. Mineral., 37, https://doi.org/10.5194/ejm-37-337-2025, 2025.

IMA no. 2025-003

• Vanadoakasakaite-(La)

• CaLa(V³⁺AlMn²⁺)(Si₂O₇)(SiO₄)O(OH)

• Vak-La

• Mogurazawa mine, Hishimachi, city of Kiryu, Gunma Prefecture, Japan (36°26^′23^′′ N, 139°22^′59^′′ E)

• Mariko Nagashima^*, Daisuke Nishio-Hamane, Masayuki Ohnishi, and Akira Harada

• ^* E-mail: nagashim@yamaguchi-u.ac.jp

• Epidote supergroup

• Monoclinic: P2₁/m; structure determined

• a= 8.9245(2), b= 5.7446(1), c= 10.1528(2) Å, β= 113.769(3)°

• 3.52(44), 3.30(39), 2.94(100), 2.87(61), 2.72(77), 2.70(42), 2.17(42), 1.66(57)

• Type material is deposited in the collections of the National Museum of Nature and Science, 4-1-1 Amakubo, Tsukuba, Ibaraki 305-0005, Japan, specimen number NSM-M53014

• How to cite: Nagashima, M., Nishio-Hamane, D., Ohnishi, M., and Harada, A.: Vanadoakasakaite-(La), IMA 2025-003, in: CNMNC Newsletter 85, Eur. J. Mineral., 37, https://doi.org/10.5194/ejm-37-337-2025, 2025.

IMA no. 2025-004

• Åsgruvanite-(Ce)

• Ce₁₆Ca₅Al(SiO₄)₆(AsO₃)₈(CO₃)₂Cl₄F₃(OH)₂

• Åsg-Ce

• Åsgruvan mine, Norberg, Västmanland, Sweden (60°04^′50^′′ N, 15°56^′25^′′ E)

• Alice Taddei, Dan Holtstam^*, Erik Jonsson, Hans-Jürgen Förster, Luca Bindi, Stefan Andersson, and Oona Appelt

• ^* E-mail: dan.holtstam@nrm.se

• New structure type

• Trigonal: $P\stackrel{\mathrm{‾}}{\mathrm{3}}m$1; structure determined

• a= 10.5728(6), c= 15.0899(11) Å

• 7.545(21), 4.381(33), 3.146(37), 2.911(100), 2.851(51), 2.829(37), 2.643(53), 1.761(22)

• Type material is deposited in the collections of the Department of Geosciences, Swedish Museum of Natural History, P.O. Box 50007, 10405 Stockholm, Sweden, collection number GEO-NRM 20240017

• How to cite: Taddei, A., Holtstam, D., Jonsson, E., Förster, H.-J., Bindi, L., Andersson, S., and Appelt, O.: Åsgruvanite-(Ce), IMA 2025-004, in: CNMNC Newsletter 85, Eur. J. Mineral., 37, https://doi.org/10.5194/ejm-37-337-2025, 2025.

IMA no. 2025-005

• Cadvanite

• Cd(VO₃)₂

• Cdv

• Burro mine, Slick Rock district, San Miguel Co., Colorado, USA (38°02^′42^′′ N 108°53^′23^′′ W)

• Anthony R. Kampf^*, Aaron J. Celestian, Chi Ma, Timothy P. Rose, and Joe Marty

• ^* E-mail: akampf@nhm.org

• Known synthetic analogue

• Monoclinic: C2/m; structure determined

• a= 9.831(10), b= 3.6220(9), c= 7.051(5) Å, β= 103.97(2)°

• 4.449(88), 3.534(84), 3.388(75), 3.166(67), 2.938(100), 2.391(88), 1.812(69), 1.475(40)

• Type material is deposited in the collections of the Natural History Museum of Los Angeles County, 900 Exposition Boulevard, Los Angeles, CA 90007, USA, catalogue numbers 76456 (holotype) and 76454 and 76457 (cotypes)

• How to cite: Kampf, A. R., Celestian, A. J., Ma, C., Rose, T. P., and Marty, J.: Cadvanite, IMA 2025-005, in: CNMNC Newsletter 85, Eur. J. Mineral., 37, https://doi.org/10.5194/ejm-37-337-2025, 2025.

IMA no. 2025-006

• Xiexiandeite

• SiO₂

• Xd

• Muonionalusta meteorite, collected on 1 May 2024 in Pajala, Norrbotten County, Sweden (67°48^′ N, 23°06.8^′ E)

• Xiangping Gu, Fabrizio Nestola^*, Matteo Ardit, Guanghua Liu, Zuokai Ke, Anatoly Kasatkin, Yanjuan Wang, and Kai Qu

• ^* E-mail: fabrizio.nestola@unipd.it

• An ultra-high-pressure (UHP) polymorph of silica

• Monoclinic: P2₁/c; structure determined

• a= 7.657(3), b= 4.091(2), c= 5.016(3) Å, β= 118.21(6)°

• 3.145(100), 2.725(64), 1.972(64), 1.949(71), 1.918(79), 1.515(52), 1.504(53), 1.493(55)

• Type material is deposited in the collections of the Geological Museum of China, No. 16, Yangrou Hutong, Xisi, Beijing 100031, People's Republic of China, catalogue number GMCTM2024014 (holotype), and the Nature and Humankind Museum, University of Padova, Corso Garibaldi 39, 35121 Padua, Italy, catalogue number MMP M23230 (cotype)

• How to cite: Gu, X., Nestola, F., Ardit, M., Liu, G., Ke, Z., Kasatkin, A., Wang, Y., and Qu, K.: Xiexiandeite, IMA 2025-006, in: CNMNC Newsletter 85, Eur. J. Mineral., 37, https://doi.org/10.5194/ejm-37-337-2025, 2025.

IMA no. 2025-009

• Bariolakargiite

• BaZrO₃

• Blak

• Hatrurim Basin, near Mt. Ye'elim, Negev desert, Hatrurim Complex, Israel (31°11^′25.5^′′ N, 35°16^′59.0^′′ E)

• Irina Galuskina^*, Yevgeny Vapnik, Krystian Prusik, and Evgeny Galuskin

• ^* E-mail: irina.galuskina@us.edu.pl

• Perovskite supergroup

• Cubic: Pm$\stackrel{\mathrm{‾}}{\mathrm{3}}m$

• a= 4.11(2) Å

• 2.906(100), 2.373(13), 2.055(34), 1.678(41), 1.453(20), 1.300(18), 1.186(7), 1.098(22)

• Type material is deposited in the collections of the Fersman Mineralogical Museum, Russian Academy of Sciences, Leninsky Pr. 18-2, 119071 Moscow, Russia, registration number 6236/1

• How to cite: Galuskina, I., Vapnik, Y., Prusik, K., and Galuskin, E.: Bariolakargiite, IMA 2025-009, in: CNMNC Newsletter 85, Eur. J. Mineral., 37, https://doi.org/10.5194/ejm-37-337-2025, 2025.

IMA no. 2025-010

• Brusnitsynite

• Mn₃CuPbAs₃Sb₂S₁₂

• Brus

• Vorontsovskoe deposit, approximately 13 km south of the city of Krasnotur'insk, Sverdlovskaya Oblast, Northern Urals, Russia (59°35^′05^′′ N, 60°12^′56^′′ E)

• Anatoly V. Kasatkin^*, Jakub Plášil, Fyodor D. Sandalov, Fabrizio Nestola, Radek Škoda, Vladislav V. Gurzhiy, Atali A. Agakhanov, and Sergey Y. Stepanov

• ^* E-mail: anatoly.kasatkin@gmail.com

• Lillianite–andorite homologous series

• Monoclinic: P2${}_{\mathrm{1}}/n$; structure determined

• a= 11.597(2), b= 18.905(4), c= 8.732(2) Å, β= 98.47(3)°

• 6.113(51), 3.264(52), 3.195(88), 2.864(61), 2.837(55), 2.831(100), 2.772(62), 2.745(49)

• Type material is deposited in the collections of the Fersman Mineralogical Museum, Russian Academy of Sciences, Leninsky Pr. 18-2, 119071 Moscow, Russia, registration number 6215/1

• How to cite: Kasatkin, A. V., Plášil, J., Sandalov, F. D., Nestola, F., Škoda, R., Gurzhiy, V. V., Agakhanov, A.A., and Stepanov, S. Y.: Brusnitsynite, IMA 2025-010, in: CNMNC Newsletter 85, Eur. J. Mineral., 37, https://doi.org/10.5194/ejm-37-337-2025, 2025.

IMA no. 2025-011

• Fuchunite

• Ba(C₂H₃O₃)₂(C₂H₄O₃)₂

• Fun

• Pusch Ridge, Santa Catalina Mountains, north of Tucson, Pima Co., Arizona, USA (32°21^′42^′′ N, 110°57^′30^′′ W, 975 m a.s.l.)

• Hexiong Yang^*, Xiangping Gu, Anthony R. Kampf, Warren Lazar, Ronald B. Gibbs, and Robert T. Downs

• ^* E-mail: hyang@arizona.edu

• New structure type

• Monoclinic: P2${}_{\mathrm{1}}/n$; structure determined

• a= 4.8265(1), b= 14.5950(4), c= 10.1908(3) Å, β= 91.011(2)°

• 8.378(100), 7.296(42), 4.579(29), 4.346(48), 4.182(30), 3.745(30), 3.422(49), 2.798(49)

• Type material is deposited in the collections of the University of Arizona Alfie Norville Gem and Mineral Museum, 115 N Church Ave Ste 121, Tucson, AZ 85701, USA, catalogue no. 22742 (holotype), and the RRUFF Project, deposition no. R240007 (cotype)

• How to cite: Yang, H., Gu, X., Kampf, A. R., Lazar, W., Gibbs, R. B., and Downs, R. T.: Fuchunite, IMA 2025-011, in: CNMNC Newsletter 85, Eur. J. Mineral., 37, https://doi.org/10.5194/ejm-37-337-2025, 2025.

IMA no. 2025-012

• Marioantofilliite

• [Cu₄Al₂(OH)₁₂](CO₃) ⋅ 3H₂O

• Maf

• Reppia mine, Monte Copello, Graveglia Valley, Ne, Genoa Province, Liguria, Italy (44°23^′11.40^′′ N, 9°27^′25.17^′′ E)

• Cristian Biagioni^*, Jiří Sejkora, Natale Perchiazzi, Enrico Mugnaioli, Daniela Mauro, Donato Belmonte, Radek Škoda, and Zdeněk Dolníček

• ^* E-mail: cristian.biagioni@unipi.it

• Hydrotalcite supergroup

• Monoclinic: C2$/m$; structure determined

• a= 5.590(3), b= 2.936(1), c= 7.675(3) Å, β= 100.96(2)°

• 7.56(100), 3.778(26), 2.750(5), 2.524(8), 2.438(4), 2.233(7), 2.044(4), 1.892(8)

• Cotype material is deposited in the collections of the Museo di Storia Naturale, University of Pisa, Via Roma 79, Calci (PI), Italy, catalogue number 20081, and the National Museum, Cirkusová 1740, 193 00 Prague 9, Czech Republic, catalogue number P1P 3/2025

• How to cite: Biagioni, C., Sejkora, J., Perchiazzi, N., Mugnaioli, E., Mauro, D., Belmonte, D., Škoda, R., and Dolníček, Z.: Marioantofilliite, IMA 2025-012, in: CNMNC Newsletter 85, Eur. J. Mineral., 37, https://doi.org/10.5194/ejm-37-337-2025, 2025.

IMA no. 2025-014

• Huanghoite-(Nd)

• BaNd(CO₃)₂F

• Hho-Nd

• Bayan Obo deposit, 130 km north of the city of Baotou, Inner Mongolia, China (41°47^′42.7^′′ N, 109°58^′15.7^′′ E)

• Shuiyuan Yang^*, Zhengxi Gao, Qing Zhang, Laishi Zhao, Fengqin Bao, Xiangping Gu, Guang Fan, and Qifeng Li

• ^* E-mail: shuiyuanyang@cug.edu.cn

• The Nd-dominant analogue of huanghoite-(Ce)

• Trigonal: $R\stackrel{\mathrm{‾}}{\mathrm{3}}m$; structure determined

• a= 5.0543(2), c= 38.334(1) Å

• 3.990(86), 3.228(100), 2.526(47), 2.134(27), 2.105(32), 1.986(51), 1.631(16), 1.565(13)

• Type material is deposited in the collections of the Geological Museum of China, No. 16, Yangrou Hutong, Xisi, Beijing 100031, People's Republic of China, catalogue number GMCTM2025004

• How to cite: Yang, S., Gao, Z., Zhang, Q., Zhao, L., Bao, F., Gu, X., Fan, G., and Li, Q.: Huanghoite-(Nd), IMA 2025-014, in: CNMNC Newsletter 85, Eur. J. Mineral., 37, https://doi.org/10.5194/ejm-37-337-2025, 2025.

3.1 Nomenclature scheme for the aeschynite group

(Zeying Zhu, Can Rao, Hong Yu, Zhenyu Chen, Bin Wu, Rucheng Wang, and Denghong Wang)

A nomenclature scheme for the aeschynite group has been approved, and end-member formulae were established for some minerals. The aeschynite group comprises aeschynite-(Ce), redefined as Ce(TiNb)O₆; aeschynite-(Nd), redefined as Nd(TiNb)O₆; aeschynite-(Y), redefined as Y(TiNb)O₆; rynersonite, CaTa₂O₆; tantalaeschynite-(Ce), Ce(TiTa)O₆; tantalaeschynite-(Y), redefined as Y(TiTa)O₆; and vigezzite, redefined as CaNb₂O₆.

Nioboaeschynite-(Ce) and nioboaeschynite-(Y) have been found to be equivalent to asechynite-(Ce) and aeschynite-(Y), respectively. Therefore, both nioboaeschynite-(Ce) and nioboaeschynite-(Y) have been discredited.

3.2 Nomenclature scheme for the monazite supergroup

(Pavel Uher, Frédéric Hatert, Martin Ondrejka, Peter Bačík, Jiří Sejkora, Radek Škoda, and Martin Števko)

The monazite supergroup has been established. Phosphates (monazite-(Ce), monazite-(La), monazite-(Nd), monazite-(Sm), monazite-(Gd), and cheralite) and arsenates (gasparite-(Ce), gasparite-(La), and rooseveltite) belong to the monazite group, whilst silicates (huttonite) and chromates (crocoite) are individual members of the supergroup.