IMA no. 2022-029

• Shijiangshanite

• Pb₃CaAl(Si₅O₁₄)(OH)₃ • 3H₂O

• Sjs

• Shijiangshan mine, Linxi County, Chifeng, Inner Mongolia, China (43^∘46^′37^′′ N, 118^∘06^′49^′′ E)

• Ningyue Sun, Guowu Li^*, Chang Li, Hongtao Shen, Yuan Xue, and Jinhua Hao

• ^* E-mail: liguowu@cugb.edu.cn

• Chemically and structurally related to wickenburgite

• Trigonal: R3c; structure determined

• a=8.7257(3), c=39.189(3) Å

• 6.587(88), 4.160(96), 3.098(100), 2.859(57), 2.547(24), 2.244(39), 2.082(28), 1.706(25)

• Type material is deposited in the mineralogical collections of the Geological Museum of China, Xisi, Yangrou Hutong No. 15, Xicheng District, Beijing, People's Republic of China, catalogue number M16135 (holotype), and the Crystal Structure Laboratory, China University of Geosciences, Beijing 100083, People's Republic of China, catalogue number SJS-1 (cotype)

• How to cite: Sun, N., Li, G., Li, C., Shen, H., Xue, Y., and Hao, J.: Shijiangshanite, IMA 2022-029, in: CNMNC Newsletter 69, Eur. J. Mineral., 34, https://doi.org/10.5194/ejm-34-463-2022, 2022.

IMA no. 2022-045

• Kayupovaite

• Na₂Mn₁₀[(Si₁₄Al₂)O₃₈(OH)₈] • 7H₂O

• Kyp

• Ushkatyn-III Mn–Fe deposit, near the town of Zhairem, Karagandy Province, Kazakhstan (48^∘16^′06^′′ N, 70^∘10^′43^′′ E)

• Oleg S. Vereshchagin^*, Sergey N. Britvin, Aleksey I. Brusnitsyn, Anastasia K. Shagova, Elena N. Perova, Igor V. Pekov, Vladimir V. Shilovskikh, Natalia S. Vlasenko, Evgeniya Y. Avdontseva, Natalia V. Platonova, and Vladimir N. Bocharov

• ^* E-mail: o.vereshchagin@spbu.ru

• The Na-dominant analogue of bannisterite

• Monoclinic: C2/c; structure determined

• a=24.9149(9), b=16.4343(5), c=22.3974(7) Å, β=94.408(3)^∘

• 12.34(100), 3.45(8), 3.09(8), 2.85(12), 2.642(11), 2.614(7), 2.414(7), 2.393(6)

• Type material is deposited in the collections of the Mineralogical Museum of the Department of Mineralogy, St Petersburg State University, Universitetskaya Emb. 7/9, St Petersburg 199034, Russia, catalogue number ML OF 458

• How to cite: Vereshchagin, O. S., Britvin, S. N., Brusnitsyn, A. I., Shagova, A. K., Perova, E. N., Pekov, I. V., Shilovskikh, V. V., Vlasenko, N. S., Avdontseva, E. Y., Platonova, N. V., and Bocharov, V. N.: Kayupovaite, IMA 2022-045, in: CNMNC Newsletter 69, Eur. J. Mineral., 34, https://doi.org/10.5194/ejm-34-463-2022, 2022.

IMA no. 2022-050

• Zhenruite

• (MoO₃)₂ • H₂O

• Zhr

• Freedom no. 2 mine, central mining area, Marysvale volcanic field, Piute Co., Utah, USA (38^∘29^′43^′′ N, 112^∘12^′55^′′ W)

• Xiangping Gu^*, Hexiong Yang, and Michael M. Scott

• ^* E-mail: guxp2004@163.com

• Known synthetic analogue

• Monoclinic: P2₁/m; structure determined

• a=9.6790(6), b=3.7065(2), c=7.1029(4) Å, β=102.391(5)^∘

• 6.93(68), 4.73(47), 3.565(24), 3.183(100), 3.139(43), 3.003(31), 2.281(20), 2.107(20)

• Type material is deposited in the collections of the University of Arizona Alfie Norville Gem & Mineral Museum, 15 N Church Ave, Tucson, AZ 85701, USA, catalogue no. 22720 (holotype), and the RRUFF Project, deposition no. R220010 (cotype)

• How to cite: Gu, X., Yang, H., and Scott, M. M.: Zhenruite, IMA 2022-050, in: CNMNC Newsletter 69, Eur. J. Mineral., 34, https://doi.org/10.5194/ejm-34-463-2022, 2022.

IMA no. 2022-051

• Chinleite-(Nd)

• NaNd(SO₄)₂(H₂O)

• Chi-Nd

• Markey mine, Red Canyon, White Canyon District, San Juan Co., Utah, USA (37^∘32^′57^′′ N, 110^∘18^′08^′′ W)

• Anthony R. Kampf^*, Chi Ma, and Joe Marty

• ^* E-mail: akampf@nhm.org

• The Nd analogue of chinleite-(Y)

• Trigonal: P3₂21; structure determined

• a=6.9540(7), c=12.8590(9) Å

• 6.02(50), 5.46(70), 3.479(44), 3.014(84), 2.837(100), 2.148(38), 1.859(55), 1.706(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 76253 and 76254

• How to cite: Kampf, A. R., Ma, C., and Marty, J.: Chinleite-(Nd), IMA 2022-051, in: CNMNC Newsletter 69, Eur. J. Mineral., 34, https://doi.org/10.5194/ejm-34-463-2022, 2022.

IMA no. 2022-052

• Auroselenide

• AuSe

• Ause

• Gaching ore occurrence, Maletoyvayam deposit, Koryak Highland, Kamchatka Peninsula, Far East, Russia (60^∘19^′51.87^′′ N, 164^∘46^′25.65^′′ E)

• Nadezhda Tolstykh, Anatoly Kasatkin^*, Fabrizio Nestola, Anna Vymazalová, Atali Agakhanov, Galina Palyanova, and Vladimir Korolyuk

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

• Known synthetic analogue

• Monoclinic: C2/m

• a=8.319(1), b=3.616(1), c=6.276(2) Å, β=104.54(2)^∘

• 4.015(54), 3.033(25), 2.780(100), 2.172(20), 1.911(16), 1.811(25), 1.653(13), 1.513(14)

• Type material is deposited in the collections of Sobolev Institute of Geology and Mineralogy, Siberian Branch of the Russian Academy of Sciences, Central Siberian Geological Museum, Akademika Koptyuga 3, Novosibirsk 630090, Russia, catalogue number IV-6/1

• How to cite: Tolstykh, N., Kasatkin, A, Nestola, F., Vymazalová, A., Agakhanov, A., Palyanova, G., and Korolyuk, V.: Auroselenide, IMA 2022-052, in: CNMNC Newsletter 69, Eur. J. Mineral., 34, https://doi.org/10.5194/ejm-34-463-2022, 2022.

IMA no. 2022-053

• Argentotetrahedrite-(Cd)

• Ag₆(Cu₄Cd₂)Sb₄S₁₃

• Attr-Cd

• Au–Ag epithermal deposit Rudno nad Hronom, Žarnovica District, Banská Bystrica Region, Slovakia (48^∘23^′47^′′ N, 18^∘40^′57^′′ E)

• Tomáš Mikuš^*, Juraj Majzlan, Jiří Sejkora, Jozef Vlasáč, Gwladys Steciuk, Jakub Plášil, Christiane Rößler, and Christian Matthes

• ^* E-mail: mikus@savbb.sk

• Tetrahedrite group

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

• a=10.65(2) Å

• 3.074(100), 2.846(6), 2.663(26), 2.510(6), 1.944(6), 1.883(48), 1.728(5), 1.606(30)

• Type material is deposited in the collections of the Department of Mineralogy and Petrology, National Museum, Cirkusová 1740, 19300 Prague 9, Czech Republic, catalogue number P1P 8/2022

• How to cite: Mikuš, T., Majzlan, J., Sejkora. J., Vlasáč, J., Steciuk, G., Plášil, J., Rößler, C., and Matthes, C.: Argentotetrahedrite-(Cd), IMA 2022-053, in: CNMNC Newsletter 69, Eur. J. Mineral., 34, https://doi.org/10.5194/ejm-34-463-2022, 2022.

IMA no. 2022-054

• Pendevilleite-(Y)

• Mg₂Y₃Al(UO₂)₂(CO₃)₇(OH)₆(H₂O)₁₆

• Pnv-Y

• Kamoto East Cu–Co deposit, Kolwezi mining district, Lualaba, Democratic Republic of the Congo (10^∘43^′08.8^′′ S, 25^∘25^′04.7^′′ E)

• Jakub Plášil^*, Gwladys Steciuk, Radek Škoda, Simon Philippo, and Mael Guennou

• ^* E-mail: plasil@fzu.cz

• New structure type

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

• a=11.9534(6), b=13.499(2), c=16.239(1) Å, α=107.183(5), β=92.532(5), γ=110.127(5)^∘

• 15.3(100), 11.44(23), 10.26(33), 8.35(32), 8.04(28), 7.16(21), 6.84(17), 6.35(28)

• Type material is deposited in the collections of the Musée National d'Histoire Naturelle, Rue Münster 25, Luxembourg 2160, Luxembourg, catalogue number VP230

• How to cite: Plášil, J., Steciuk, G., Škoda, R., Philippo, S., and Guennou, M.: Pendevilleite-(Y), IMA 2022-054, in: CNMNC Newsletter 69, Eur. J. Mineral., 34, https://doi.org/10.5194/ejm-34-463-2022, 2022.

IMA no. 2019-067b

• Deltanitrogen

• N

• δN

• As inclusion within diamonds from the São Luís river alluvial deposits, Juína, Mato Grosso, Brazil (11^∘29^′35^′′ S, 58^∘58^′14^′′ W)

• Oliver Tschauner^*, Oded Navon, and Christian Schmidt

• ^* E-mail: oliver.tschauner@ unlv.edu

• Known synthetic analogue

• Orthorhombic: Pccn; structure determined

• a=8.442(10), b=8.136(9), c=5.974(10) Å

• 2.661(100), 2.655(40), 2.630 (53), 2.582(47), 2.438(31), 2.426(55), 2.406(35), 2.369(42)

• Type material is deposited in the mineralogical collections of the Royal Ontario Museum, 100 Queens Park, Toronto, ON M5S 2C6, Canada, accession number M59805

• How to cite: Tschauner, O., Navon, O., and Schmidt, C.: Deltanitrogen, IMA 2019-067b, in: CNMNC Newsletter 69, Eur. J. Mineral., 34, https://doi.org/10.5194/ejm-34-463-2022, 2022.

Nomenclature of polymorphs and polysomes

New guidelines for the nomenclature of polymorphs and polysomes have been approved by the CNMNC:

• Polymorphs with different crystal systems. These are distinguished by the prefixes cubo- (cubic), hexa- (hexagonal), tetra- (tetragonal), trigo- (trigonal), ortho- (orthorhombic), clino- (monoclinic), and anortho- (triclinic).

• Polymorphs with different crystal systems but showing a pseudosymmetry. These should show the prefix “pseudo-”.

• Polymorphs with the same crystal system but different space groups. These are distinguished by the prefix “para-”. If three or more polymorphs show the same crystal system but different space groups, the space group notation may be added as a suffix, but such a nomenclature should be avoided if possible.

• Polymorphs with the same space group. These are distinguished by the prefix “para-”.

• Minerals with polymorph suffixes but with different chemical compositions. These cannot be considered true polymorphs, so we recommend using the prefix “meta-”, which indicates a close but significantly different chemical composition.

• Polysomatic symbols have to be placed as a suffix, which indicates the number and types of modules which alternate in the structure as in the högbomite supergroup, or as prefixes as in the sartorite homologous series.

These recommendations have to be applied for future new mineral proposals, but the modifications of historical and well-established names have to pass through the CNMNC for approval. In order to be consistent with the new guidelines, 25 mineral names were modified: domeykite-β becomes trigodomeykite, fergusonite-(Y)-β becomes clinofergusonite-(Y), fergusonite-(Ce)-β becomes clinofergusonite-(Ce), fergusonite-(Nd)-β becomes clinofergusonite-(Nd), ice-VII becomes cubo-ice, roselite-β becomes anorthoroselite, sulfur-β becomes clinosulfur, mertieite-II becomes mertieite, mertieite-I becomes pseudomertieite, uranophane-α becomes uranophane, uranophane-β becomes parauranophane, gersdorffite-P2₁3 becomes gersdorffite, gersdorffite-Pa3 becomes paragersdorffite, gersdorffite-Pca2₁ becomes orthogersdorffite, betalomonosovite becomes paralomonosovite, lammerite-β becomes paralammerite, nováčekite-I becomes hydronováčekite, nováčekite-II becomes nováčekite, halloysite-7Å becomes halloysite, halloysite-10Å becomes hydrohalloysite, metauranocircite-I becomes metauranocircite, taimyrite-I becomes taimyrite, uranocircite-II becomes uranocircite, andorite IV becomes quatrandorite, and andorite VI becomes senandorite.

4.1 Voting proposal 22-E: redefinition of braggite and vysotskite

Proposal 22-E is accepted. The ideal formula for braggite is redefined as PdPt₃S₄. The ideal formula for vysotskite is redefined as PdS. The ideal formula of cooperite (PtS) remains as currently given in the IMA List of Minerals.

4.2 Uranotungstite: revised formula

Recently, a paper was published (American Mineralogist, 107, 1709–1716, 2022), in which the chemical formula of uranotungstite was revised based on its crystal structure determination. From these data, collected on the type material, it is shown that the species is not Fe²⁺-dominant, as in the original description (Tschermaks Mineralogische und Petrographische Mitteilungen, 34, 25–34, 1985), but Ba-dominant. Consequently, in agreement with the new chemical and structural data obtained on this mineral and with the dominant constituent rule, the formula of uranotungstite is modified from (Fe²⁺,Ba,Pb)(UO₂)₂(WO₄)(OH)₄ • 12H₂O to Ba(UO₂)₂W₂O₈(OH)₂ • H₂O. This is an executive decision taken by the CNMNC officers.