The information given here is provided by the IMA Commission on New Minerals, Nomenclature and Classification for comparative purposes and as a service to mineralogists working on new species.
Each mineral is described in the following format:
Mineral name, if the authors agree on its release prior to the full description appearing in press
Chemical formula (ideal formula)
Mineral symbol
Type locality
Full authorship of proposal
E-mail address of corresponding author
Relationship to other minerals
Crystal system, Space group; Structure determined, yes or no
Unit-cell parameters
Strongest lines in the powder X-ray diffraction pattern
Type specimen repository and specimen number
Citation details for the mineral prior to publication of full description
Citation details concern the fact that this information will be published in the Mineralogical Magazine on a routine basis, as well as being added month by month to the commission’s website.
It is still a requirement for the authors to publish a full description of the new mineral.
No other information will be released by the commission
New mineral proposals approved in August 2026
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 
$\bar 3$; 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. (2026) Proxicosahedrite, IMA 2023-077c. CNMNC Newsletter 93, Mineralogical Magazine, 90, https://doi.org/10.1180/mgm.2026.10265.
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. (2026) Wusiheite, IMA 2025-083a. CNMNC Newsletter 93, Mineralogical Magazine, 90, https://doi.org/10.1180/mgm.2026.10265.
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 numbers 77410 and 77411
How to cite: Kampf, A.R., Adams, P.M., Ma, C. and Lynch, D.K. (2026) Bromammoniac, IMA 2025-103a. CNMNC Newsletter 93, Mineralogical Magazine, 90, https://doi.org/10.1180/mgm.2026.10265.
IMA No. 2026-018
Usagreite
[Hg2+3S2](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 sulphate 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. (2026) Usagreite, IMA 2026-018. CNMNC Newsletter 93, Mineralogical Magazine, 90, https://doi.org/10.1180/mgm.2026.10265.
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. (2026) Aluminomacfallite, IMA 2026-019. CNMNC Newsletter 93, Mineralogical Magazine, 90, https://doi.org/10.1180/mgm.2026.10265.
IMA No. 2026-020
Lincioite
[Ni2+2Fe3+4O2(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 
$\bar 3$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. (2026) Lincioite, IMA 2026-020. CNMNC Newsletter 93, Mineralogical Magazine, 90, https://doi.org/10.1180/mgm.2026.10265.
IMA No. 2026-023
Wolfgangpauliite
Ca1.5K(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. (2026) Wolfgangpauliite, IMA 2026-023. CNMNC Newsletter 93, Mineralogical Magazine, 90, https://doi.org/10.1180/mgm.2026.10265.
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. (2026) Sainzbarandaite, IMA 2026-024. CNMNC Newsletter 93, Mineralogical Magazine, 90, https://doi.org/10.1180/mgm.2026.10265.
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 
$\bar 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. (2026) Rozhdestvenskayaite-(Fe), IMA 2026-025. CNMNC Newsletter 93, Mineralogical Magazine, 90, https://doi.org/10.1180/mgm.2026.10265.
New mineral proposals approved in September 2026
IMA No. 2026-001
Carolinaite
[Cu2+4Pb4O2(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. (2026) Carolinaite, IMA 2026-001. CNMNC Newsletter 93, Mineralogical Magazine, 90, https://doi.org/10.1180/mgm.2026.10265.
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, I-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. (2026) Vallettaite, IMA 2026-026. CNMNC Newsletter 93, Mineralogical Magazine, 90, https://doi.org/10.1180/mgm.2026.10265.
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. (2026) Hydroxylpaulkerrite, IMA 2026-028. CNMNC Newsletter 93, Mineralogical Magazine, 90, https://doi.org/10.1180/mgm.2026.10265.
IMA No. 2026-029
Gambatesaite
Ca2Cu2+2Mn3+Te6+2O11(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. (2026) Gambatesaite, IMA 2026-029. CNMNC Newsletter 93, Mineralogical Magazine, 90, https://doi.org/10.1180/mgm.2026.10265.
Other issues
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 Pb2+9Pb4+2(CrO4)O12. Thanks to Frank de Wit for pointing this out.
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.
