EJM European Journal of Mineralogy EJMEur. J. Mineral. 1617-4011 Copernicus Publications Göttingen, Germany 10.5194/ejm-38-347-2026IMA Commission on New Minerals, Nomenclature and Classification (CNMNC) – Newsletter 91CNMNC Newsletter 91 BosiFerdinando https://orcid.org/0000-0002-8407-2540 HatertFrédéric https://orcid.org/0000-0003-3125-9755 PaseroMarco marco.pasero@unipi.it MillsStuart J. Dipartimento di Scienze della Terra, Sapienza Università di Roma, Piazzale Aldo Moro 5, 00185 Rome, Italy Laboratoire de Minéralogie, Université de Liège, Bâtiment B18, Sart Tilman, 4000 Liège, Belgium Dipartimento di Scienze della Terra, Università di Pisa, Via Santa Maria 53, 56126 Pisa, Italy Gallery of Natural Art, P.O. Box 830460, Richardson, TX 75083, USA Chair, CNMNC Vice-Chair, CNMNC Secretary, CNMNC Marco Pasero (marco.pasero@unipi.it)19June2026 38 3 347352 Copyright: © 2026 Ferdinando Bosi et al. 2026 This work is licensed under the Creative Commons Attribution 4.0 International License. To view a copy of this licence, visit https://creativecommons.org/licenses/by/4.0/This article is available from https://ejm.copernicus.org/articles/38/347/2026/ejm-38-347-2026.htmlThe full text article is available as a PDF file from https://ejm.copernicus.org/articles/38/347/2026/ejm-38-347-2026.pdf

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 X-ray powder 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 European Journal of Mineralogy 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 April 2026 IMA no. 2025-031b

Piilonenite-(Nd)

NaNd(CO3)2(H2O)3

Pii-Nd

Poudrette (Demix) quarry, Mont Saint-Hilaire, Quebec, Canada (45°33′46′′ N, 73°08′30′′ W)

Inna Lykova*, Ralph Rowe, Simon Teat, Glenn Poirier, and Stephanie Barnes

* E-mail: ilykova@nature.ca

New structure type

Orthorhombic: P212121; structure determined

a=6.791(1), b=17.135(3) Å, c=6.436(1)

8.59(100), 4.690(14), 4.529(7), 4.291(30), 4.123(7), 3.417(10), 3.175(17), 2.859(8)

Type material is deposited in the collections of the Canadian Museum of Nature, 240 McLeod Street, Ottawa, ON K2P 2R1, Canada, catalogue number CMNMC 93393

How to cite: Lykova, I., Rowe, R., Teat, S., Poirier, G., and Barnes, S.: Piilonenite-(Nd), IMA 2025-031b, in: CNMNC Newsletter 91, Eur. J. Mineral., 38, 10.5194/ejm-38-347-2026, 2026.

IMA no. 2025-101

Kristekite

Cu2(H2O)4(UO2)(SeO3)3 ⋅ 4H2O

Kik

In the mine dump of the shaft no. 11A, near Bytíz, Příbram ore district, Central Bohemia, Czech Republic (49°41′18.89′′ N, 14°04′13.15′′ E)

Jakub Plášil*, Pavel Škácha, Jiří Sejkora, Radek Škoda, and Radana Vrtišková

* E-mail: plasil@fzu.cz

Chemically related to marthozite

Monoclinic: P21/m; structure determined

a=6.3664(2), b=15.8932(4), c=8.1248(3) Å, β=91.437(2)°

8.197(53), 7.293(100), 5.718(7), 4.100(40), 3.647(7), 3.247(7), 3.129(5), 2.974(9)

Type material is deposited in the collections of the Department of Mineralogy and Petrology, National Museum, Cirkusová 1740, 19300 Praha 9, Czech Republic, catalogue number P1P 46/2025

How to cite: Plášil, J., Škácha, P., Sejkora, J., Škoda, R., and Vrtišková, R.: Kristekite, IMA 2025-101, in: CNMNC Newsletter 91, Eur. J. Mineral., 38, 10.5194/ejm-38-347-2026, 2026.

IMA no. 2025-102

Magnesiochangesite-(Ce)

(Ca8Ce)□Mg(PO4)7

Mcgs-Ce

Lunar meteorite Pakepake005, discovered in the Taklamakan desert, Xinjiang, China (38°50′22′′ N, 83°42′18′′ E)

Yanjuan Wang*, Zengqian Hou, Xiaochao Che, Arianna E. Lanza, Fernando Cámara, Zhenyu Chen, Cheng Yue, Ze Liu, Qingqing Yin, Tao Long, Maxwell C. Day, Francesca Innocenzi, Lisa Santello, Anna Barbaro, Simone Molinari, Ziyao Wang, Junping Ren, Ran Zhang, Kai Qu, and Fabrizio Nestola*

* E-mail: wangyanjuan_cugb@foxmail.com, fabrizio.nestola@unipd.it

Cerite supergroup

Trigonal: R3c; structure determined

a=10.3813(4), c=37.278(1) Å

3.430(16), 3.190(16), 2.865(100), 2.591(39), 2.089(29), 1.878(12), 1.810(13), 1.715(20)

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 GMCTM2025021

How to cite: Wang, Y., Hou, Z., Che, X., Lanza, A. E., Cámara, F., Chen, Z., Yue, C., Liu, Z., Yin, Q., Long, T., Day, M. C., Innocenzi, F., Santello, L., Barbaro, A., Molinari, S., Wang, Z., Ren, J., Zhang, R., Qu, K., and Nestola, F.: Magnesiochangesite-(Ce), IMA 2025-102, in: CNMNC Newsletter 91, Eur. J. Mineral., 38, 10.5194/ejm-38-347-2026, 2026.

New mineral proposals approved in May 2026 IMA no. 2025-072

Bernwoodite

Ca5TiAl2Si2O14

Bew

As inclusion in a diamond from the Rio Sorriso placer, Juina area, Mato Grosso, Brazil (11°19′59′′ S, 59°10′59′′ W)

Nester Korolev*, Ekaterina S. Kiseeva, Alena Aslandukova, George E. Harlow, Chi Ma, Yaakov Weiss, Alexander Kurnosov, Felix V. Kaminsky, and Leonid Dubrovinsky

* E-mail: nkorolev@amnh.org

Perovskite supergroup

Monoclinic: C2/c; structure determined

a=9.190(1), b=5.2594(4), c=21.846(4) Å, β=97.84(2)°

2.647(100), 2.643(67), 2.189(17), 2.152(46), 1.522(56), 1.521(30), 1.183(18), 1.178(24)

Type material is deposited in the collections of the American Museum of Natural History, 200 Central Park West, New York, NY 10024-5102, USA, catalogue no. AMNH#115649

How to cite: Korolev, N., Kiseeva, E. S., Aslandukova, A., Harlow, G. E., Ma, C., Weiss, Y., Kurnosov, A., Kaminsky, F. V., and Dubrovinsky, L.: Bernwoodite, IMA 2025-072, in: CNMNC Newsletter 91, Eur. J. Mineral., 38, 10.5194/ejm-38-347-2026, 2026.

IMA no. 2025-093

Georgeliuite

Ca2Mn33+O2(AsO4)3(H2O)2 ⋅ H2O

Geg

Jote mine, Pampa Larga district, Tierra Amarilla, Copiapó Province, Atacama Region, Chile (27°36′30′′ S, 70°09′23′′ W)

Xiangping Gu, Hexiong Yang*, Linfei Qiu, Guang Fan, Robert A. Jenkins, Ronald B. Gibbs, and Robert T. Downs

* E-mail: hyang@arizona.edu

The Mn3+ analogue of arseniosiderite

Monoclinic: Cm; structure determined

a=11.3112(9), b=20.163(1), c=8.9858(7) Å, β=100.539(7)°

8.803(10), 5.734(19), 3.345(23), 3.241(26), 2.930(21), 2.803(61), 2.656(22), 2.520(20)

Type material is deposited in the collections of the University of Arizona Alfie Norville Gem & Mineral Museum, 115 N Church Ave Ste 121, Tucson, AZ 85701, USA, catalogue number 22747 (holotype), and the RRUFF Project, deposition number R250055 (cotype)

How to cite: Gu, X., Yang, H., Qiu, L., Fan, G., Jenkins, R. A., Gibbs, R. B., and Downs, R. T.: Georgeliuite, IMA 2025-093, in: CNMNC Newsletter 91, Eur. J. Mineral., 38, 10.5194/ejm-38-347-2026, 2026.

IMA no. 2025-095a

Sombrereteite

NaCa3(Al7Si9)O32

Som

Sombrerete iron meteorite, found in 1958 at Cerro del Sombreretillo, Zacatecas, Mexico (23°38′ N, 103°40′ W)

Xiangping Gu, Zuokai Ke, Hexiong Yang*, Kai Qu, Guanghua Liu, Yixuan Liu, Yizhou Chen, Ran Gao, Qun Ai, Shuting Huang, Baihui Ma, and Yang Liu

* E-mail: hyang@arizona.edu

Chemically, the sodium analogue of wodegongjieite

Monoclinic: C2/c; structure determined

a=10.2358(1), b=17.8056(3), c=14.9349(3) Å, β=90.420(1)°

4.429(73), 3.816(99), 3.743(100), 3.351(36), 3.272(48), 2.854(68), 2.561(71), 1.866(21)

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 GMCTM2025019

How to cite: Gu, X., Ke, Z., Yang, H., Qu, K., Liu, G., Liu, Y., Chen, Y., Gao, R., Ai, Q., Huang, S., Ma, B., and Liu, Y.: Sombrereteite, IMA 2025-095a, in: CNMNC Newsletter 91, Eur. J. Mineral., 38, 10.5194/ejm-38-347-2026, 2026.

IMA no. 2026-002

Leishmanite

Ba(H2O)4[(UO2)3O2(OH)3]2 ⋅ 3H2O

Lhm

On the northern slope of the Grand Alou valley, south of the Dent de Nendaz (2463 m), Nendaz, Valais, Switzerland (46°08′40′′ N, 7°17′37′′ E)

Jakub Plášil*, Radek Škoda, Stefan Ansermet, and Nicolas Meisser

* E-mail: plasil@fzu.cz

Closely related to billietite

Orthorhombic: Pmn21; structure determined

a=12.079(2), b=15.096(3), c=7.155(2) Å

7.46(100), 6.09(10), 3.789(30), 3.601(20), 3.519(40), 3.249(45), 3.186(60), 2.044(15)

Type material is deposited in the collections of the Department of Geology, State Museum of Natural Sciences (Naturéum), Anthropole, Dorigny, 1015 Lausanne, Switzerland, catalogue number MGL101918

How to cite: Plášil, J., Škoda, R., Ansermet, S., and Meisser, N.: Leishmanite, IMA 2026-002, in: CNMNC Newsletter 91, Eur. J. Mineral., 38, 10.5194/ejm-38-347-2026, 2026.

Nomenclature/classification proposals approved in March 2026 IMA 25-B – stilpnomelane group: composition range, franklinphilite and ekmanite discredited

(Richard A. Eggleton, Penelope L. King, Frank Brink, Peter Self, and Aaron Dodd)

Proposal 25-B on the nomenclature of the stilpnomelane group is accepted. The general formula of minerals belonging to this group is A4M48[Si64Al8](O,(OH))216 ⋅ nH2O, where A= K, Na, Ca, and Ba, and M= Fe2+, Mn, Mg, Al, Fe3+, and Zn. The end-member formula of stilpnomelane is K4Fe482+[Si64Al8]O164(OH)52 ⋅ nH2O, and lennilenapeite is redefined as an Mn analogue with the end-member formula K4Mn482+[Si64Al8]O164(OH)52 ⋅ nH2O. Ekmanite is a stilpnomelane with minor Mn, and franklinphilite is a mixture of lennilenapeite and nelenite; both minerals are consequently discredited.

 IMA 26-A – definition of a gadolinite-(Y) neotype

(Dan Holtstam, Alice Taddei, Hans-Jürgen Förster, and Oona Appelt)

Proposal 26-A is accepted, and the neotype material for gadolinite-(Y) is redefined from the Ytterby locality, Sweden. The sample is stored in the collections of the Swedish Museum of Natural History, P.O. Box 50007, 10405 Stockholm, Sweden, catalogue no. GEO-NRM LK6893.

 Other issues Polish-up of the IMA List of Minerals (second round)

After a similar action made some years ago (see CNMNC Newsletter 50), the IMA-CNMNC is making effective a number of minor changes in the ideal chemical formulae of mineral species. In most cases the change merely consists of the elimination of subordinate constituents occurring within the same parentheses together with the dominant constituent. Minerals marked as Q (questionable) in the IMA List of Minerals were not considered since these deserve a more detailed re-appraisal. Similarly, minerals belonging to a supergroup for which the IMA-CNMNC approved a comprehensive report were left behind too as those formulae have already been discussed and agreed upon by a dedicated subcommittee. This is an executive decision taken by the IMA-CNMNC. Aldridgeite Current formula: Cd(Cu,Zn)4(SO4)2(OH)6(H2O)3 New formula: CdCu4(SO4)2(OH)6(H2O)3 [Cf. devilline: CaCu4(SO4)2(OH)6(H2O)3] Aluminocopiapite Current formula: (Al,Mg)Fe43+(SO4)6(OH,O)2(H2O)14 ⋅ 6H2O New formula: AlFe43+(SO4)6O(OH)(H2O)14 ⋅ 6H2O [Cf. magnesiocopiapite: MgFe43+(SO4)6(OH)2(H2O)14 ⋅ 6H2O] Alumovesuvianite Current formula: Ca19Al(Al10Mg2)Si18O69(OH)9 New formula: Ca19Al(Al10Mg2)(SiO4)10(Si2O7)4O(OH)9 [Cf. manganvesuvianite: Ca19Mn3+(Al10Mg2)(SiO4)10(Si2O7)4O(OH)9] Ankerite Current formula: Ca(Fe2+,Mg)(CO3)2 New formula: CaFe2+(CO3)2 [Cf. dolomite: CaMg(CO3)2] Arsenbrackebuschite Current formula: Pb2(Fe3+,Zn)(AsO4)2(OH,H2O) New formula: Pb2Fe3+(AsO4)2(OH) [Cf. feinglosite: Pb2Zn(AsO4)2 ⋅ H2O] Azoproite Current formula: Mg2[(Ti,Mg),Fe3+]O2(BO3) New formula: Mg2(Ti0.5Mg0.5)O2(BO3) [Cf. ludwigite: Mg2Fe3+O2(BO3)] Bannisterite Current formula: (Ca,K,Na)(Mn2+,Fe2+)10(Si,Al)16O38(OH)8 ⋅ nH2O New formula: CaMn102+[(Si14Al2)O38(OH)8] ⋅ nH2O [Cf. kayupovaite: Na2Mn102+[(Si14Al2)O38(OH)8] ⋅ 7H2O] Barićite Current formula: (Mg,Fe)3(PO4)2(H2O)8 New formula: Mg3(PO4)2(H2O)8 [Cf. vivianite: Fe32+(PO4)2(H2O)8] Barquillite Current formula: Cu2(Cd,Fe)GeS4 New formula: Cu2CdGeS4 [Cf. briartite: Cu2FeGeS4] Borisenkoite Current formula: Cu3[(V,As)O4]2 New formula: Cu3(VO4)2 [Cf. kayupovaite: Cu3(AsO4)2] Bouazzerite Current formula: Bi6(Mg,Co)11Fe14(AsO4)18O12(OH)4(H2O)86 New formula: Bi6Mg11Fe14(AsO4)18O12(OH)4(H2O)86 Byrudite Current formula: (Be,?)(V3+,Ti)3O6 New formula: BeV23+TiO6 [Cf. verbierite: BeCr23+TiO6] Carbocernaite Current formula: (Sr,Ce,La)(Ca,Na)(CO3)2 New formula: SrCa(CO3)2 Chlorophoenicite Current formula: (Mn,Mg,Zn)3Zn2(AsO4)(OH,O)6 New formula: Mn3Zn2(OH)6As[O3(OH)3] [Cf. peterchinite: Zn3Zn2(OH)6As[O3(OH)3]] Cyprine Current formula: Ca19Cu2+(Al,Mg)12Si18O69(OH)9 New formula: Ca19Cu2+(Al11Mg)(SiO4)10(Si2O7)4O(OH)9 [Cf. magnesiovesuvianite: Ca19Mg(Al11Mg)(SiO4)10(Si2O7)4O(OH)9] Eckhardite Current formula: (Ca,Pb)Cu2+Te6+O5(H2O) New formula: CaCu2+Te6+O5(H2O) Fluorvesuvianite Current formula: Ca19(Al,Mg)13(SiO4)10(Si2O7)4O(F,OH)9 New formula: Ca19Al(Al10Mg2)(SiO4)10(Si2O7)4OF9 [Cf. alumovesuvianite: Ca19Al(Al10Mg2)(SiO4)10(Si2O7)4O(OH)9] Fontarnauite Current formula: (Na,K)2(Sr,Ca)(SO4)[B5O8(OH)](H2O)2 New formula: Na2Sr(SO4)[B5O8(OH)](H2O)2 Fritzscheite Current formula: Mn2+(UO2)2(VO4,PO4)2 ⋅ 4H2O New formula: Mn2+(UO2)2(VO4)2 ⋅ 4H2O [Cf. lehnerite: Mn2+(UO2)2(PO4)2 ⋅ 8H2O] Gainesite Current formula: Na2(Be,Li)Zr2(PO4)4 ⋅ 1.5H2O New formula: Na2BeZr2(PO4)4 ⋅ 1.5H2O Hloušekite Current formula: (Ni,Co)Cu4(AsO4)2(AsO3OH)2(H2O)7 ⋅ H2O New formula: NiCu4(AsO4)2(AsO3OH)2(H2O)8 ⋅ H2O Hydrombobomkulite Current formula: (Ni,Cu)Al4(NO3,SO4)2(OH)12(H2O)14 New formula: NiAl4(NO3)2(OH)12(H2O)14 Johnwalkite Current formula: K(Mn2+,Fe3+)2(Nb,Ta)O2(PO4)2 ⋅ 2(H2O,OH) New formula: KMn22+NbO2(PO4)2(H2O)2 [Cf. olmsteadite: KFe22+NbO2(PO4)2(H2O)2] Laitakarite Current formula: Bi4(Se,S)3 New formula: Bi4Se3 [Cf. ikunolite: Bi4S3] Lasnierite Current formula: (Ca,Sr)(Mg,Fe2+)2Al(PO4)3 New formula: CaMg2Al(PO4)3 Lucabindiite Current formula: (K,NH4)As4O6(Cl,Br) New formula: K(As2O3)2Cl Lusernaite-(Y) Current formula: Y4Al(CO3)2(OH,F)11(H2O)4 ⋅ 2H2O New formula: Y4Al(CO3)2(OH)11(H2O)4 ⋅ 2H2O Magnesiochlorophoenicite Current formula: Mg3Zn2(AsO4)(OH,O)6 New formula: Mg3Zn2(OH)6As[O3(OH)3] [Cf. peterchinite: Zn3Zn2(OH)6As[O3(OH)3]] Magnesioneptunite Current formula: KNa2Li(Mg,Fe)2Ti2Si8O24 New formula: KNa2LiMg2Ti2Si8O24 [Cf. neptunite: KNa2LiFe22+Ti2Si8O24] Magnesiorowlandite-(Y) Current formula: Y4(Mg,Fe)(Si2O7)2F2 New formula: Y4Mg(Si2O7)2F2 [Cf. rowlandite-(Y): Y4Fe2+(Si2O7)2F2] Mbobomkulite Current formula: (Ni,Cu)Al4(NO3,SO4)2(OH)12(H2O)3 New formula: NiAl4(NO3)2(OH)12(H2O)3 Mccrillisite Current formula: NaCs(Be,Li)Zr2(PO4)4 ⋅ 1-2H2O New formula: NaCsBeZr2(PO4)4 ⋅ 1-2H2O Montroseite Current formula: (V3+,Fe2+,V4+)O(OH) New formula: V3+O(OH) Murunskite Current formula: K2(Cu,Fe)4S4 New formula: K2(Cu3+Fe3+)S4 [Cf. thalcusite: Tl2(Cu3+Fe3+)S4] Nordgauite Current formula: MnAl2(PO4)2(F,OH)2(H2O)4 ⋅ H2O New formula: MnAl2(PO4)2F2(H2O)4 ⋅ H2O [Cf. kayrobertsonite: MnAl2(PO4)2(OH)2(H2O)4 ⋅ 2H2O] Ohmilite Current formula: Sr3(Ti,Fe3+)(Si2O6)2(O,OH)(H2O)2 New formula: Sr3Ti(Si2O6)2O(H2O)2 [Cf. yuzuxiangite: Sr3Fe3+(Si2O6)2(OH)(H2O)3] Paraniite-(Y) Current formula: (Ca,Y,Dy)2Y(WO4)2(AsO4) New formula: Ca2Y(WO4)2(AsO4) Paratacamite Current formula: Cu3(Cu,Zn)(OH)6Cl2 New formula: Cu3Cu(OH)6Cl2 Paratacamite-(Mg) Current formula: Cu3(Mg,Cu)(OH)6Cl2 New formula: Cu3Mg(OH)6Cl2 Paratacamite-(Ni) Current formula: Cu3(Ni,Cu)(OH)6Cl2 New formula: Cu3Ni(OH)6Cl2 Plumboagardite Current formula: (Pb,REE,Ca)Cu6(AsO4)3(OH)6(H2O)3 New formula: PbCu6(AsO4)2(AsO3OH)(OH)6(H2O)3 [Cf. zálesíite: CaCu6(AsO4)2(AsO3OH)(OH)6(H2O)3] Potassiccarpholite Current formula: K(Mn2+,Li)2Al4Si4O12(OH,F)8 New formula: K(Mn2+Li)Al4Si4O12(OH)8 Putzite Current formula: (Cu,Ag)8GeS6 New formula: Cu8GeS6 [Cf. argyrodite: Ag8GeS6] Serpierite Current formula: Ca(Cu,Zn)4(SO4)2(OH)6(H2O)3 New formula: CaCu4(SO4)2(OH)6(H2O)3

Thalcusite Current formula: Tl2(Cu,Fe)4S4 New formula: Tl2(Cu3+Fe3+)S4 [Cf. bukovite: Tl2(Cu3+Fe3+)Se4] Thorutite Current formula: (Th,U,Ca)Ti2(O,OH)6 New formula: ThTi2O6 [Cf. brannerite: UTi2O6] Yttrotungstite-(Ce) Current formula: CeW2O6(OH)3 New formula: CeW2O7(OH)(H2O) [Cf. yttrotungstite-(Nd): NdW2O7(OH)(H2O)]

Yttrotungstite-(Y) Current formula: Y(W,Fe,Si,Al,Ti)2(O,OH,H2O)9 New formula: YW2O7(OH)(H2O) [Cf. yttrotungstite-(Nd): NdW2O7(OH)(H2O)] Zincobriartite Current formula: Cu2(Zn,Fe)(Ge,Ga)S4 New formula: Cu2ZnGeS4 [Cf. briartite: Cu2FeGeS4]