IMA no. 2023-020a

• Metaheimite

• PbCu₂(AsO₄)(OH)₃

• Mhim

• Grosses Chalttal deposit, Mürtschenalp district, Glarus, Switzerland (47°04^′09.9^′′ N, 9°11^′26.5^′′ E)

• Thomas Malcherek^*, Boriana Mihailova, Jochen Schlüter, Philippe Roth, and Nicolas Meisser

• ^* E-mail: thomas.malcherek@uni-hamburg.de

• New structure type

• Monoclinic: P2₁/n; structure determined

• a=5.8347(4), b=7.7528(6), c=13.8899(9) Å, β=90.018(3)°

• 7.070(43), 3.863(67), 3.139(100), 2.926(38), 2.778(37), 2.673(59), 2.546(41), 1.609(44)

• Type material is deposited in the collections of the Mineralogical Museum, Leibniz-Institut zur Analyse des Biodiversitätswandels, Grindelallee 48, 20146 Hamburg, Germany, registration number ro-3702

• How to cite: Malcherek, T., Mihailova, B., Schlüter, J., Roth, P., and Meisser, N.: Metaheimite, IMA 2023-020a, in: CNMNC Newsletter 83, Eur. J. Mineral., 37, https://doi.org/10.5194/ejm-37-75-2025, 2025.

IMA no. 2024-036

• Meizhouite

• Fe²⁺V${}_{\mathrm{2}}^{\mathrm{3}+}$(PO₄)₂(OH)₂

• Mzh

• Yushui deposit, about 16 km northeast of Meizhou, Guangdong Province, China (24°25^′18^′′ N, 116°11^′48^′′ E)

• Wei Yao, Peng Liu^*, Guowu Li, Ningyue Sun, Yuan Xue, Changzhi Wu, Wenqiang Yang, Wenlei Song, and Nigel Cook

• ^* E-mail: pengliu@nwu.edu.cn

• Lazulite group

• Monoclinic: P2₁/c; structure determined

• a=7.2992(9), b=7.4560(5), c=7.475(1) Å, β=120.53(1)°

• 6.383(36), 4.871(58), 3.338(100), 3.244(49), 3.164(39), 2.290(28), 2.026(22), 1.614(18)

• 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 GMCTM2024006

• How to cite: Yao, Q., Liu, P., Li, G., Sun, N., Xue, Y., Wu, C., Yang, W., Song, W., and Cook, N.: Meizhouite, IMA 2024-036, in: CNMNC Newsletter 83, Eur. J. Mineral., 37, https://doi.org/10.5194/ejm-37-75-2025, 2025.

IMA no. 2024-063

• Szilagyiite

• NaCa₃(UO₂)(CO₃)₃(SeO₃)F(H₂O)₆

• Szg

• Pickett Corral mine, Montrose Co., Colorado, USA (38°11^′50.0^′′ N, 108°50^′30.0^′′ W)

• Travis A. Olds^*, Christopher Emproto, Anthony R. Kampf, Chi Ma, and Joe Marty

• ^* E-mail: oldst@carnegiemnh.org

• New structure type

• Trigonal: R3c; structure determined

• a=9.6542(9), c=33.465(5) Å

• 5.916(100), 4.836(58), 3.744(77), 3.125(33), 2.960(60), 2.795(62), 1.828(40), 1.744(35)

• Type material is deposited in the collections of the Carnegie Museum of Natural History, 4400 Forbes Avenue, Pittsburgh, PA 15213, USA, catalogue number CM34760

• How to cite: Olds, T. A., Emproto, C., Kampf, A. R., Ma, C., and Marty, J.: Szilagyiite, IMA 2024-063, in: CNMNC Newsletter 83, Eur. J. Mineral., 37, https://doi.org/10.5194/ejm-37-75-2025, 2025.

IMA no. 2024-064

• Stunorthropite

• (NH₄)₄[Mo₂O₆(MoO₄)₂]

• Snp

• Summit group of claims, near Cookes Peak, southern end of the Cookes Range, Luna Co., New Mexico, USA (32°33^′47^′′ N, 107°43^′48^′′ W)

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

• ^* E-mail: hyang@arizona.edu

• Known synthetic analogue

• Triclinic: $P\stackrel{\mathrm{‾}}{\mathrm{1}}$; structure determined

• a=7.9503(2), b=7.2863(1), c=7.2724(2) Å, α=94.397(1), β=114.556(1), γ=82.617(1)°

• 7.202(39), 6.343(100), 5.072(38), 4.831(57), 3.651(73), 3.351(53), 3.291(50), 3.194(16)

• Type material is deposited in the collections of the New Mexico Bureau of Geology and Mineral Resources, Mineral Museum, 801 Leroy Place, Socorro, NM 87801-4796, USA, catalogue number 19195 (holotype), and the RRUFF Project, deposition number R240001 (cotype)

• How to cite: Yang, H., Gu, X., Kampf, A. R., Gibbs, R. B., Rakovan, J., and Downs, R. T.: Stunorthropite, IMA 2024-064, in: CNMNC Newsletter 83, Eur. J. Mineral., 37, https://doi.org/10.5194/ejm-37-75-2025, 2025.

IMA no. 2024-065

• Stibiosegnitite

• Pb(Fe${}_{\mathrm{2.5}}^{\mathrm{3}+}$Sb${}_{\mathrm{0.5}}^{\mathrm{5}+}$)(AsO₄)₂(OH)₆

• Ssgt

• Phosphatno-Arsenatnaya Vein, 245 m level of the southern open pit of the Murzinskoe deposit, Krasnoshchyokovsky District, Altai Krai, Western Siberia, Russia (51°35^′24.1^′′ N, 82°36^′41.4^′′ E)

• Anatoly V. Kasatkin^*, Natalia V. Zubkova, Radek Škoda, Nikita V. Chukanov, Fabrizio Nestola, Vladislav V. Gurzhiy, Atali A. Agakhanov, Dmitry I. Belakovskiy, and Vladimir S. Lednev

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

• Alunite supergroup

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

• a=7.3462(7), c=17.115(2) Å

• 5.967(83), 3.674(51), 3.088(100), 2.857(31), 2.554(17), 2.284(23), 1.988(22), 1.837(15)

• 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 6154/1

• How to cite: Kasatkin, A. V., Zubkova, N. V., Škoda, R., Chukanov, N. V., Nestola, F., Gurzhiy, V. V., Agakhanov, A. A., Belakovskiy, D. I., and Lednev, V. S.: Stibiosegnitite, IMA 2024-065, in: CNMNC Newsletter 83, Eur. J. Mineral., 37, https://doi.org/10.5194/ejm-37-75-2025, 2025.

IMA no. 2024-060

• Anningite-(Ce)

• (Ca_0.5Ce${}_{\mathrm{0.5}}^{\mathrm{4}+})$(VO₄)

• Aig-Ce

• Gara Samani Formation, about 40 km east of the village of Meguidene, 2 km southeast of the RN 51 national road linking the towns of Timimoun and El Menia, Algeria (29°41^′31.14^′′ N, 1°56^′20.62^′′ E)

• Dorota Środek^*, RafałJuroszek, Georgia Cametti, Madani Benyoucef, Imad Bouchemla, Tomasz Krzykawski, and Mariusz Salamon

• ^* E-mail: dorota.srodek@us.edu.pl

• Xenotime group

• Tetragonal: I4₁/amd; structure determined

• a=7.1500(4), c=6.3343(7) Å

• 3.575(100), 2.684(61), 2.528(14), 2.231(12), 1.840(56), 1.788(16), 1.599(12), 1.488(17)

• Type material is deposited in the collections of the Natural History Museum, Reichklarastrasse 10, 55116 Mainz, Germany, catalogue number NHMMZ M 2024/2 LS

• How to cite: Środek, D., Juroszek, R., Cametti, G., Benyoucef, M., Bouchemla, I., Krzykawski, T., and Salamon, S.: Anningite-(Ce), IMA 2024-060, in: CNMNC Newsletter 83, Eur. J. Mineral., 37, https://doi.org/10.5194/ejm-37-75-2025, 2025.

IMA no. 2024-067

• Dulanggouite

• Bi₆Te₃

• Dlg

• Dulanggou gold mine, about 250 km west of Chengdu, China (30°58^′50^′′  N, 101°36^′30^′′ E)

• Shiji Zheng^*, Cuihua Chen, Yuan Xue, Weiguang Zhu, Zhongjie Bai, Guowu Li, Ningyue Sun, and Kaixuan Li

• ^* E-mail: zhengshiji@mail.gyig.ac.cn

• Known synthetic analogue

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

• a=4.4639(4), c=17.904(1) Å

• 3.252(100), 2.367(24), 2.238(37), 1.993(11), 1.843(11), 1.626(9), 1.488(13), 1.423(18)

• 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 GMCTM2024009

• How to cite: Zheng, S., Chen, C., Xue, Y., Zhu, W., Bai, Z., Li, G., Sun, N., and Li, K.: Dulanggouite, IMA 2024-067, in: CNMNC Newsletter 83, Eur. J. Mineral., 37, https://doi.org/10.5194/ejm-37-75-2025, 2025.

IMA no. 2024-068

• Svornostite-(NH₄)

• (NH₄)₂Mg(UO₂)₂(SO₄)₄(H₂O)₈

• Svo-NH₄

• Blue Lizard mine, Red Canyon, White Canyon District, San Juan Co., Utah, USA (37°33^′26^′′ N, 110°17^′44^′′ W)

• Anthony R. Kampf^*, Travis A. Olds, Jakub Plášil, Chi Ma, Aaron J. Celestian, and Joe Marty

• ^* E-mail: akampf@nhm.org

• The ammonium analogue of svornostite

• Orthorhombic: Pmn2₁; structure determined

• a=13.0259(9), b=8.2909(4), c=11.2589(4) Å

• 8.287(28), 6.538(100), 5.118(32), 4.649(47), 3.343(44), 3.020(42), 2.112(27), 2.067(27)

• Cotype 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 76445, 76446, 76447, and 76448

• How to cite: Kampf, A. R., Olds, T. A., Plášil, J., Ma, C., Celestian, A. J., and Marty, J.: Svornostite-(NH₄), IMA 2024-068, in: CNMNC Newsletter 83, Eur. J. Mineral., 37, https://doi.org/10.5194/ejm-37-75-2025, 2025.

3.1 IMA 24-D: kaolinite neotype proposal

(Jeffrey de Fourestier, David L. Bish, Juergen Schieber, Chengdong Liu, and Shanchu Han)

Proposal 24-D is accepted, and neotype samples are defined for kaolinite. The type locality is the village of Gaoling, Jiangxi Province, China. Neotype material is deposited in the mineralogical collection of the Canadian Museum of Nature, Ottawa, Canada, under catalogue numbers CMNMC 91699 [JDZ-K8] and CMNMC 91700 [JDZ-W1].

3.2 IMA 24-E: proposal to change the formula of metaschoderite back to Al₂(PO₄)(VO₄) ⋅ 6H₂O

(Erika Kiechle and Thomas Witzke)

Proposal 24-E on metaschoderite is accepted, and the formula of this species is changed back to Al₂(PO₄)(VO₄) ⋅ 6H₂O, according to the original description.

Nolanite supergroup – another round of voting

(Nikita V. Chukanov, Vasilisa M. Gridchina, Ramiza K. Rastsvetaeva, Natalia V. Zubkova, and Igor V. Pekov)

Subsequent to the approval of the nolanite supergroup report (see CNMNC newsletter 80) and during the review of the manuscript, some additional queries arose. Therefore a second round of voting has become necessary on a revised version in which the criticism raised has been addressed. The main update with respect to the previous approval is the following: the nolanite supergroup has been subdivided into three groups (kamiokite group, nolanite group, rinmanite group) not only in accordance with the largest charge of the species-defining octahedral cations (namely, cations at the M1 and M2 sites, which are considered as a whole) but also taking into account the dominant X species (X= O or OH).

Establishment of the svornostite group and renaming of svornostite and oldsite

(Anthony R. Kampf, Travis A. Olds, Jakub Plášil, Chi Ma, Aaron J. Celestian, and Joe Marty)

Concurrent with the approval of the new mineral svornostite-(NH₄) (IMA no. 2024-068; this newsletter), the svornostite group has been established. As part of this, the minerals svornostite and oldsite have been renamed svornostite-(K) and oldsite-(K), respectively. The svornostite group is divided into the svornostite subgroup, which includes svornostite-(K), svornostite-(NH₄), and oldsite-(K), and the rietveldite subgroup, which includes rietveldite and zincorietveldite.

Voting majority for CNMNC proposals on new minerals, nomenclature changes, and mineral groups

(Ferdinando Bosi, Frédéric Hatert, Marco Pasero, and Stuart J. Mills)

The officers' proposal, stemming from discussions among members during the CNMNC business meeting on 20 August 2024, at the European Mineralogical Conference (EMC) in Dublin, to increase the voting majority required for proposals submitted to the CNMNC has been approved. As a result, the CNMNC has adopted a new threshold requiring more than 75 % positive votes for the approval of new minerals, nomenclature changes, and the establishment of mineral groups or supergroups. The chair or the officer in charge retains the authority to suspend voting if significant concerns are raised by members.