IMA no. 2023-077c

• Proxicosahedrite

• Al₅₂Cu₃₀Fe₁₁Si₇

• Pxd

• In a micro-spherule of a micrometeorite found on top of Mt. Gariglione, about 65 km north of the city of Catanzaro, Calabria, Italy (39°07^′55^′′ N, 16°40^′12^′′ E)

• Giovanna Agrosì, Enrico Mugnaioli, Guangming Cheng, Nan Yao, Johan Villeneuve, and Luca Bindi^*

• ^* E-mail: luca.bindi@unifi.it

• Known synthetic analogue

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

• a=12.3443(4) Å

• 3.904(11), 3.424(22), 3.299(12), 2.117(61), 2.057(25), 2.002(100), 1.952(8), 1.247(31)

• Type material is deposited in the collections of the Museo di Scienze della Terra, University of Bari, Via Orabona 4, 70125 Bari, Italy, registration number 19/nm

• How to cite: Agrosì, G., Mugnaioli, E., Cheng, G., Yao, N., Villeneuve, J., and Bindi, L.: Proxicosahedrite, IMA 2023-077c, in: CNMNC Newsletter 93, Eur. J. Mineral., 38, https://doi.org/10.5194/ejm-38-629-2026, 2026.

IMA no. 2025-083a

• Wusiheite

• BaGe(Ge₃O₉)

• Wsh

• Wusihe lead–zinc deposit, Sichuan Province, China (29°16^′27^′′ N, 102°53^′23^′′ E)

• Hanjie Wen, Chuanwei Zhu, Yiping Yang, Zhenyi Tan, Jiaxin Xi, Haiyang Xian, Jianxi Zhu^*, and Hongping He

• ^* E-mail: zhujx@gig.ac.cn

• The Ge–Ge analogue of benitoite

• Trigonal: P321; structure determined

• a=11.7492(3), c=4.7781(1) Å

• 5.913(50), 3.639(40), 2.493(21), 2.400(17), 1.995(78), 1.369(54), 1.289(32), 1.139(199)

• Type material is deposited in the collections of the National Geological Museum of China, No. 16, Yangrou Hutong, Xisi, Beijing 100031, People's Republic of China, catalogue number GMCTM2026004

• How to cite: Wen, H., Zhu, C., Yang, Y., Tan, Z., Xi, J., Xian, H., Zhu, J., and He, H.: Wusiheite, IMA 2025-083a, in: CNMNC Newsletter 93, Eur. J. Mineral., 38, https://doi.org/10.5194/ejm-38-629-2026, 2026.

IMA no. 2025-103a

• Bromammoniac

• NH₄Br

• Bram

• From an active vent in a burning bituminous shale of the Monterey formation, on a sea cliff talus slope along the Pacific coast, Hope Ranch, Santa Barbara, Santa Barbara Co., California, USA (34°24^′35.2^′′ N, 119°45^′59.1^′′ W)

• Anthony R. Kampf^*, Paul M. Adams, Chi Ma, and David K. Lynch

• ^* E-mail: akampf@nhm.org

• The bromine analogue of salammoniac

• Cubic: Pm3m; structure determined

• a=4.0161(2) Å

• 4.013(45), 2.838(100), 2.318(15), 2.007(16), 1.796(22), 1.639(30), 1.339(10), 1.270(11)

• 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 number 77410 and 77411

• How to cite: Kampf, A. R., Adams, P. M., Ma, C., and Lynch, D. K.: Bromammoniac, IMA 2025-103a, in: CNMNC Newsletter 93, Eur. J. Mineral., 38, https://doi.org/10.5194/ejm-38-629-2026, 2026.

IMA no. 2026-018

• Usagreite

• [Hg${}_{\mathrm{3}}^{\mathrm{2}+}$S₂](SO₄)

• Ugr

• Mariquita mine (20 m level), Badajoz Province, Extremadura Autonomous Community, Spain (38°21^′23^′′ N, 6°11^′03^′′ W)

• Christopher Emproto^*, Travis A. Olds, Borja Sainz de Baranda Graf, Anthony R. Kampf, Chi Ma, and Michael Cox

• ^* E-mail: emprotoc@carnegiemnh.org

• Chemically, the sulfate analogue of alexearlite

• Monoclinic: P2₁; structure determined

• a=14.2049(5), b=8.2089(3), c=14.2085(5) Å, β=120.009(2)°

• 4.922(36), 4.077(24), 3.892(77), 3.551(28), 3.082(47), 2.880(100), 2.045(27), 1.775(46)

• Type material is deposited in the collections of the Carnegie Museum of Natural History, 4400 Forbes Avenue, Pittsburgh, PA 15213, USA, catalogue numbers CM35010 (holotype) and CM35011 (cotype)

• How to cite: Emproto, C., Olds, T. A., Sainz de Baranda Graf, B., Kampf, A. R., Ma, C., and Cox, M.: Usagreite, IMA 2026-018, in: CNMNC Newsletter 93, Eur. J. Mineral., 38, https://doi.org/10.5194/ejm-38-629-2026, 2026.

IMA no. 2026-019

• Aluminomacfallite

• Ca₂Mn³⁺AlMn³⁺(SiO₄)(Si₂O₇)(OH)₃

• Amcf

• Kokuriki mine, Tokoro, Kitami City, Hokkaido, Japan (43°99^′62^′′ N, 143°94^′27^′′ E)

• Mariko Nagashima^* and Daisuke Nishio-Hamane

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

• The Al analogue of macfallite

• Monoclinic: P2₁/m; structure determined

• a=8.9239(4), b=6.0380(2), c=10.1530(5) Å, β=110.202(5)°

• 4.76(37), 3.88(63), 2.95(100), 2.71(53), 2.67(41), 2.55(65), 2.39(41), 1.63(52)

• 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-M54121

• How to cite: Nagashima, M. and Nishio-Hamane, D.: Aluminomacfallite, IMA 2026-019, in: CNMNC Newsletter 93, Eur. J. Mineral., 38, https://doi.org/10.5194/ejm-38-629-2026, 2026.

IMA no. 2026-020

• Lincioite

• [Ni${}_{\mathrm{2}}^{\mathrm{2}+}$Fe${}_{\mathrm{4}}^{\mathrm{3}+}$O₂(OH)₁₀](CO₃) ⋅ 3H₂O

• Lco

• Lagoscuro mine, Ceranesi (GE), Liguria, Italy (44°28^′35^′′ N, 8°51^′35^′′ E)

• Donato Belmonte^*, Cristian Biagioni, Jiří Sejkora, Giovanni Orazio Lepore, Gabriele Giuli, Valeria De Santis, Radek Škoda, and Zdeněk Dolníček

• ^* E-mail: donato.belmonte@unige.it

• Hydrotalcite supergroup

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

• a=3.0769(2), c=22.449(1) Å

• 7.55(100), 3.755(33), 2.595(59), 2.293(48), 1.933(44), 1.619(17), 1.540(27), 1.507(23)

• Cotype material is deposited in the collections of the Museo di Storia Naturale, University of Pisa, Via Roma 79, Calci (PI), Italy, catalogue number 20085, the Dipartimento di Scienze della Terra, dell'Ambiente e della Vita (DISTAV), Università di Genova, Corso Europa 26, Genova, Italy, catalogue number MO486, and the Department of Mineralogy and Petrology, National Museum, Cirkusová 1740, 19300 Prague 9, Czech Republic, catalogue number P1P 15/2026

• How to cite: Belmonte, D., Biagioni, C., Sejkora, J., Lepore, G. O., Giuli, G., De Santis, V., Škoda, R., and Dolníček, Z.: Lincioite, IMA 2026-020, in: CNMNC Newsletter 93, Eur. J. Mineral., 38, https://doi.org/10.5194/ejm-38-629-2026, 2026.

IMA no. 2026-023

• Wolfgangpauliite

• Ca_1.5K(H₂O)_5.5[(UO₂)₃O₂(PO₄)₂]

• Wpa

• Bois Noirs-Limouzat mine, Forez massif, Saint-Priest-la-Prugne, Loire department, Rhône-Alpes-Auvergne region, France (45°57^′49^′′ N, 3°43^′25^′′ E; 770 m a.s.l.)

• Jakub Plášil^*, Kshitij Gurung, Radek Škoda, Stefan Ansermet, and Nicolas Meisser

• ^* E-mail: plasil@fzu.cz

• Chemically and structurally related to françoisite-(Ce)

• Monoclinic: C2/m; structure determined

• a=13.6449(2), b=15.2469(9), c=9.3518(3) Å, β=112.573(3)°

• 8.652(11), 7.767(100), 5.778(20), 3.877(33), 3.422(14), 3.130(23), 2.886(13), 1.672(2)

• Type material is deposited in the collections of the Department of Geology, Muséum Cantonal des Sciences Naturelles (Naturéum), Université de Lausanne (UNIL), Anthropole, 1015 Lausanne, Switzerland, collection number MGL111261

• How to cite: Plášil, J., Gurung, K., Škoda, R., Ansermet, S., and Meisser, N.: Wolfgangpauliite, IMA 2026-023, in: CNMNC Newsletter 93, Eur. J. Mineral., 38, https://doi.org/10.5194/ejm-38-629-2026, 2026.

IMA no. 2026-024

• Sainzbarandaite

• Ca₇Al₄F₂₆(H₂O)₅

• Sbd

• Qinglong Mine, Dachang Sb ore field, Qinglong County, Qianxinan, Guizhou, China (25°40^′24^′′ N, 105°10^′24^′′ E)

• Christian Rewitzer, Rupert Hochleitner, Ian E. Grey^*, Anthony R. Kampf, Stephanie Boer, Colin M. MacRae, and William G. Mumme

• ^* E-mail: ian.grey@csiro.au

• Chemically and structurally related to gearksutite and carlhintzeite

• Monoclinic: P2₁/c; structure determined

• a=12.1062(5), b=6.2040(2), c=29.881(1) Å, β=92.139(4)°

• 9.277(68), 4.638(22), 3.111(100), 2.262(34), 1.961(50), 1.845(39), 1.807(23), 1.664(28)

• Type material is deposited in the collections of the Bavarian State Mineral Collection, Theresienstrasse 41, 80333 München, Germany, registration number MSM39517 (holotype), and the Natural History Museum of Los Angeles County, 900 Exposition Boulevard, Los Angeles, CA 90007, USA, catalogue number 77447 (cotype)

• How to cite: Rewitzer, C., Hochleitner, R., Grey, I. E., Kampf, A. R., Boer, S., MacRae, C. M., and Mumme, W. G.: Sainzbarandaite, IMA 2026-024, in: CNMNC Newsletter 93, Eur. J. Mineral., 38, https://doi.org/10.5194/ejm-38-629-2026, 2026.

IMA no. 2026-025

• Rozhdestvenskayaite-(Fe)

• Ag₆(Ag₄Fe₂)Sb₄S₁₃

• Roz-Fe

• Bianjiadayuan deposit, southern segment of the Great Hinggan Range metallogenic belt, China (43°31^′24^′′ N, 118°03^′45^′′ E)

• Xuexiang Gu^*, Yongmei Zhang, Xinli Wang, Xiangping Gu, Guang Fan, Anli Zhang, Qihui Shi, and Jiangpeng Liu

• ^* E-mail: xuexiang_gu@163.com

• Tetrahedrite group

• Cubic: $I\stackrel{\mathrm{‾}}{\mathrm{4}}$3m; structure determined

• a=10.9102(8) Å

• 7.695(18), 3.150(100), 2.724(17), 2.567(6), 2.138(5), 1.994(5), 1.929(21), 1.644(11)

• Type material is deposited in the collections of Geological Museum of China, No. 16, Yangrou Hutong, Xisi, Beijing 100031, People's Republic of China, catalogue number GMCTM2026005

• How to cite: Gu, X., Zhang, Y., Wang, X., Gu, X., Fan, G., Zhang, A., Shi, Q., and Liu, J.: Rozhdestvenskayaite-(Fe), IMA 2026-025, in: CNMNC Newsletter 93, Eur. J. Mineral., 38, https://doi.org/10.5194/ejm-38-629-2026, 2026.

IMA no. 2026-001

• Carolinaite

• [Cu${}_{\mathrm{4}}^{\mathrm{2}+}$Pb₄O₂(OH)₈(SO₄)(H₂O)₂] ⋅ (SO₄)(H₂O)₂

• Crln

• Redmond mine, Haywood Co., North Carolina, USA (35°40^′55^′′ N, 83°00^′56^′′ W)

• Christopher Emproto^*, Travis A. Olds, Anthony R. Kampf, Michael S. Rumsey, Chi Ma, Simon J. Teat, Jason B. Smith, Stephen A. Rust, Paul M. Adams, Jacob Bauer, and John M. Hughes

• ^* E-mail: emprotoc@carnegiemnh.org

• New structure type

• Monoclinic: P2/c; structure determined

• a=13.629(2), b=7.311(1), c=11.442(2) Å, β=114.656(9)°

• 12.471(61), 6.227(62), 5.741(29), 3.676(38), 3.374(31), 3.137(98), 2.797(100), 2.361(28)

• 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 77407, 77408 and 77409, and the Carnegie Museum of Natural History, 4400 Forbes Avenue, Pittsburgh, PA 15213, USA, catalogue number CM35013

• How to cite: Emproto, C., Olds, T. A., Kampf, A. R., Rumsey, M. S., Ma, C., Teat, S. J., Smith, J. B., Rust, S. A., Adams, P. M., Bauer, J., and Hughes, J. M.: Carolinaite, IMA 2026-001, in: CNMNC Newsletter 93, Eur. J. Mineral., 38, https://doi.org/10.5194/ejm-38-629-2026, 2026.

IMA no. 2026-026

• Vallettaite

• Na₂Mn²⁺(Mn²⁺Fe³⁺)(AsO₄)₃

• Vtt

• Valletta mine, Vallone della Valletta, Canosio (CN), Maira Valley, Piedmont, Italy (44°23^′54^′′ N, 7°05^′37^′′ E; 2560 m a.s.l.)

• Fernando Cámara^*, Valentina Conforti, Lisa Baratelli, Fabrizio Nestola, Marco E. Ciriotti, Roberto Bracco, Gianluca Odicino, and Gian Carlo Piccoli

• ^* E-mail: fernando.camara@unimi.it

• Alluaudite supergroup

• Monoclinic: C2/c; structure determined

• a=12.1741(5), b=13.0328(5), c=6.7861(3) Å, β=113.451(5)°

• 6.448(25), 3.252(66), 2.974(41), 2.805(100), 2.662(84), 1.836(24), 1.680(37), 1.365(25)

• Type material is deposited in the collections of the Museo delle Collezioni di Mineralogia, Gemmologia, Petrologia e Giacimentologia, Dipartimento di Scienze della Terra “A. Desio”, Università di Milano, Via Botticelli 23, 20133 Milano, Italy, catalogue number MCMGPG-H2026-001

• How to cite: Cámara, F., Conforti, V., Baratelli, L., Nestola, F., Ciriotti, M. E., Bracco, R., Odicino, G., and Piccoli, G. C.: Vallettaite, IMA 2026-026, in: CNMNC Newsletter 93, Eur. J. Mineral., 38, https://doi.org/10.5194/ejm-38-629-2026, 2026.

IMA no. 2026-028

• Hydroxylpaulkerrite

• [(H₂O)K]Mg₂(Fe₂Ti)(PO₄)₄[O(OH)](H₂O)₁₀ ⋅ 4H₂O

• Hpke

• Hühnerkobel pegmatite mine, near the Rabenstein hamlet, Zwiesel, Bavarian Forest, Germany (49°03^′06^′′ N, 13°10^′10^′′ E)

• Christian Rewitzer, Rupert Hochleitner, Ian E. Grey^*, Anthony R. Kampf, Colin M. MacRae, Stephanie Boer, Robert W. Gable, and William G. Mumme

• ^* E-mail: ian.grey@csiro.au

• Paulkerrite group

• Monoclinic: P2₁/c; structure determined

• a=10.512(3), b=20.404(5), c=12.383(2) Å, β=90.09°

• 10.202(53), 7.462(18), 7.456(17), 6.192(100), 3.120(32), 3.119(32), 3.096(20), 2.883(26)

• Type material is deposited in the collections of the Bavarian State Mineral Collection, Theresienstrasse 41, 80333 München, Germany, registration number MSM39518 (holotype), and the Natural History Museum of Los Angeles County, 900 Exposition Boulevard, Los Angeles, CA 90007, USA, catalogue number 77448 (cotype)

• How to cite: Rewitzer, C., Hochleitner, R., Grey, I. E., Kampf, A. R., MacRae, C. M., Boer, S., Gable, R. W., and Mumme, W. G.: Hydroxylpaulkerrite, IMA 2026-028, in: CNMNC Newsletter 93, Eur. J. Mineral., 38, https://doi.org/10.5194/ejm-38-629-2026, 2026.

IMA no. 2026-029

• Gambatesaite

• Ca₂Cu${}_{\mathrm{2}}^{\mathrm{2}+}$Mn³⁺Te${}_{\mathrm{2}}^{\mathrm{6}+}$O₁₁(OH)(H₂O)₆

• Gb

• Gambatesa mine, Reppia, Ne (GE), Liguria, Italy (44°21^′34^′′ N, 9°26^′59^′′ E)

• Anthony R. Kampf^*, Christopher Emproto, Travis A. Olds, Chi Ma, Stuart J. Mills, Owen P. Missen, Simon J. Teat, and Fabrizio Castellaro

• ^* E-mail: akampf@nhm.org

• New structure type

• Trigonal: P312; structure determined

• a=5.2530(3), c=15.073(1) Å

• 7.582(100), 4.353(23), 3.791(27), 3.385(33), 2.631(22), 2.490(50), 2.163(25), 1.822(41)

• 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 77450, 77451, and 77452

• How to cite: Kampf, A. R., Emproto, C., Olds, T. A., Ma, C., Mills, S. J., Missen, O. P., Teat, S. J., and Castellaro, F.: Gambatesaite, IMA 2026-029, in: CNMNC Newsletter 93, Eur. J. Mineral., 38, https://doi.org/10.5194/ejm-38-629-2026, 2026.

3.1 Re-writing of the chemical formula of santanaite

In the IMA List of Minerals, the chemical formula of santanaite is given as Pb₁₁CrO₁₆. The above formula is oversimplified and does not reflect the presence of lead in both the Pb²⁺ and Pb⁴⁺ oxidation states, as detailed in the original publication [Neues Jahrbuch für Mineralogie Monatshefte, 1972, 455–458]. A more correct formula is Pb${}_{\mathrm{9}}^{\mathrm{2}+}$Pb${}_{\mathrm{2}}^{\mathrm{4}+}$(CrO₄)O₁₂. Thanks are given to Frank de Wit for pointing this out.

3.2 Correct space group for shojiite

The correct space group of the new mineral shojiite (IMA no. 2024-023a) is P2₁/m and not C2/m, as wrongly reported in CNMNC Newsletter 87.