IMA no. 2018-135a

• Xuite

• Ca₃Fe₂[(AlO₃(OH)]₃

• Menan volcanic complex, near Rexburg, Madison Co., Idaho, USA (43^∘47^′03^′′ N, 111^∘58^′23^′′ W – holotype); paralava from Gillette, Campbell Co., Wyoming, USA (cotype)

• Seungyeol Lee* and Xiaofeng Guo

• *E-mail: slee2@lpi.usra.edu

• Garnet supergroup

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

• a=12.5056(5) Å

• 5.106(16), 4.421(65), 3.342(24), 3.126(62), 2.796(100), 2.666(15), 2.552(63), 2.028(5)

• Type material is deposited in the mineralogical collections of the Geology Museum of the Department of Geoscience, University of Wisconsin-Madison, 1215 West Dayton Street, Madison, WI 53706, USA, catalogue numbers UWGM 2341 (holotype – Rexburg), UWGM 2342, UWGM 2343, UWGM 2352, and UWGM 2353 (cotypes – Rexburg and Gillette)

• How to cite: Lee, S. and Guo, X.: Xuite, IMA 2018-135a, in: CNMNC Newsletter 59, Eur. J. Mineral., 33, https://doi.org/10.5194/ejm-33-139-2021, 2021.

IMA no. 2020-066

• Hydroxymcglassonite-(K)

• KSr₄Si₈O₂₀(OH)•8H₂O

• Wessels mine, Kalahari manganese fields, Northern Cape Province, South Africa (27^∘06^′51.82^′′ S, 22^∘51^′18.31^′′ E)

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

• *E-mail: hyang@arizona.edu

• Apophyllite group

• Tetragonal: P4/mcn; structure determined

• a=9.0792(2), c=16.1551(9) Å

• 8.008(94), 4.539(42), 3.940(50), 3.638(81), 3.055(34), 2.993(58), 2.800(28), 2.538(100)

• Type material is deposited in the collections of the University of Arizona Mineral Museum, 1601 E University Blvd, Tucson, AZ 85719, USA, catalogue number 22691 (holotype), and the RRUFF Project, deposition number R200004 (cotype)

• How to cite: Yang, H., Gu, X., and Scott, M. M.: Hydroxymcglassonite-(K), IMA 2020-066, in: CNMNC Newsletter 59, Eur. J. Mineral., 33, https://doi.org/10.5194/ejm-33-139-2021, 2021.

IMA no. 2020-067

• Donowensite

• Ca(H₂O)₃Fe${}_{\mathrm{2}}^{\mathrm{3}+}$(V₂O₇)₂

• North Wilson pit, Wilson Springs mine (also known as Union Carbide mine), Wilson Springs (also known as Potash Sulfur Springs), Garland Co., Arkansas, USA (34^∘28^′40^′′ N, 92^∘58^′05^′′ W)

• Anthony R. Kampf*, John M. Hughes, Barbara P. Nash, and Jason B. Smith

• *E-mail: akampf@nhm.org

• New structure type

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

• a=7.3452(4), b=9.9291(4), c=10.0151(7) Å,
  α=94.455(7), β=98.476(7), γ=100.779(7)^∘

• 9.88(100), 7.12(24), 4.176(17), 3.671(20), 3.283(44), 3.202(22), 3.110(19), 2.973(26)

• Cotype material is deposited in the mineralogical collections of the Natural History Museum of Los Angeles County, 900 Exposition Boulevard, Los Angeles, CA 90007, USA, catalogue numbers 75041 and 75042

• How to cite: Kampf, A. R., Hughes, J. M., Nash, B. P., and Smith, J. B.: Donowensite, IMA 2020-067, in: CNMNC Newsletter 59, Eur. J. Mineral., 33, https://doi.org/10.5194/ejm-33-139-2021, 2021.

IMA no. 2020-068

• Mikehowardite

• Fe${}_{\mathrm{4}}^{\mathrm{3}+}$(V⁵⁺O₄)₄(H₂O)₂•H₂O

• North Wilson pit, Wilson Springs mine (also known as Union Carbide mine), Wilson Springs (also known as Potash Sulfur Springs), Garland Co., Arkansas, USA (34^∘28^′40^′′ N, 92^∘58^′05^′′ W)

• Anthony R. Kampf*, John M. Hughes, Barbara P. Nash, and Jason B. Smith

• *E-mail: akampf@nhm.org

• Structurally related to schubnelite

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

• a=6.655(2), b=6.669(1), c=9.003(2) Å, α=76.515(5), β=84.400(6), γ=75.058(5)^∘

• 8.799(86), 6.449(100), 3.693(29), 3.198(88), 2.982(50), 2.909(59), 2.792(31), 2.145(30)

• Cotype material is deposited in the mineralogical collections of the Natural History Museum of Los Angeles County, 900 Exposition Boulevard, Los Angeles, CA 90007, USA, catalogue numbers 75041 and 75042

• How to cite: Kampf, A. R., Hughes, J. M., Nash, B. P., and Smith, J. B.: Mikehowardite, IMA 2020-068, in: CNMNC Newsletter 59, Eur. J. Mineral., 33, https://doi.org/10.5194/ejm-33-139-2021, 2021.

IMA no. 2020-069

• Argentotetrahedrite-(Zn)

• Ag₆(Cu₄Zn₂)Sb₄S₁₃

• Kremnica deposit, Žiar nad Hronom District, Banská Bystrica Region, Slovakia (48^∘42^′44^′′ N, 18^∘54^′07^′′ E – type locality); Lengenbach quarry, Imfeld, Binn Valley, Canton of Valais, Switzerland (46^∘21^′54^′′ N, 8^∘13^′15^′′ E – cotype locality)

• Jiří Sejkora, Cristian Biagioni*, Martin Števko, Thomas Raber, and Philippe Roth

• *E-mail: cristian.biagioni@unipi.it

• Tetrahedrite group

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

• a=10.550(1) Å

• 7.460(24), 3.046(100), 2.820(6), 2.638(23), 2.487(6), 2.249(6), 1.865(35), 1.591(18)

• Type material is deposited in the collections of the Department of Mineralogy and Petrology, National Museum in Prague, Cirkusová 1740, 19300 Praha 9, Czech Republic, catalogue number P1P 51/2020 (Kremnica), and the Museo di Storia Naturale, Università di Pisa, Via Roma 79, Calci (PI), catalogue numbers 19922 (Kremnica) and 19923 (Lengenbach)

• How to cite: Sejkora, J., Biagioni, C., Števko, M., Raber, T., and Roth, P.: Argentotetrahedrite-(Zn), IMA 2020-069, in: CNMNC Newsletter 59, Eur. J. Mineral., 33, https://doi.org/10.5194/ejm-33-139-2021, 2021.

IMA no. 2020-070

• Zolenskyite

• FeCr₂S₄

• Indarch meteorite, fell on 7 April 1891 at Shusha, Azerbaijan (40^∘04^′09^′′ N, 47^∘12^′15^′′ E)

• Chi Ma*

• *E-mail: chima@caltech.edu

• The Fe analogue of brezinaite and a dimorph of daubréelite

• Monoclinic: C2/m

• a=12.84(1), b=3.44(1), c=5.94(1) Å, β=117(1)^∘

• 5.251(52), 2.977(47), 2.646(92), 2.625(46), 2.067(93), 2.057(100), 1.720(47), 1.716(78)

• Type material is deposited in the meteorite collection of the Division of Geological and Planetary Sciences, California Institute of Technology, 1200 East California Boulevard, Pasadena, CA 91125, USA, catalogue numbers ICM1 and ICM3

• How to cite: Ma, C.: Zolenskyite, IMA 2020-070, in: CNMNC Newsletter 59, Eur. J. Mineral., 33, https://doi.org/10.5194/ejm-33-139-2021, 2021.

IMA no. 2020-071

• Makotoite

• Ag₁₂(Cu₃Au)S₈

• Funan gold deposit, ca. 16 km west of Zhaoyuan, Shandong Province, China (37^∘23^′34^′′ N, 120^∘16^′05^′′ E)

• Xiangping Gu*

• *E-mail: guxp2004@163.com

• The Cu–Au-ordered analogue of uytenbogaardtite

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

• a=13.584(2), c=16.781(3) Å

• 6.873(29), 2.788(16), 2.690(74), 2.576(100), 2.339(32), 2.104(44), 1.970(34), 1.762(19)

• Type material is deposited in the mineralogical collection of the Geological Museum of China, No. 16, Yangrou Hutong, Xisi, Beijing 100031, People's Republic of China, catalogue number M16110

• How to cite: Gu, X.: Makotoite, IMA 2020-071, in: CNMNC Newsletter 59, Eur. J. Mineral., 33, https://doi.org/10.5194/ejm-33-139-2021, 2021.

IMA no. 2020-072

• Thebaite-(NH₄)

• (NH₄)₃Al(C₂O₄)(PO₃OH)₂(H₂O)

• The 125-foot level of the Rowley mine, ca. 20 km northwest of Theba, Maricopa Co., Arizona, USA (33^∘02^′57^′′ N, 113^∘01^′58^′′ W)

• Anthony R. Kampf*, Mark A. Cooper, Aaron J. Celestian, Barbara P. Nash, and Joe Marty

• *E-mail: akampf@nhm.org

• New structure type

• Monoclinic: P2₁/c; structure determined

• a=11.156(9), b=6.234(6), c=18.65(2) Å, β=102.93(1)^∘

• 9.21(88), 7.88(24), 5.39(44), 4.93(26), 4.56(32), 3.350(39), 3.112(100), 2.964(42)

• Type material is deposited in the mineralogical collections of the Natural History Museum of Los Angeles County, 900 Exposition Boulevard, Los Angeles, CA 90007, USA, catalogue number 75082

• How to cite: Kampf, A. R., Cooper, M. A., Celestian, A. J., Nash, B. P., and Marty, J.: Thebaite-(NH₄), IMA 2020-072, in: CNMNC Newsletter 59, Eur. J. Mineral., 33, https://doi.org/10.5194/ejm-33-139-2021, 2021.

IMA no. 2020-073

• Devilliersite

• Ca₄Ca₂Fe${}_{\mathrm{10}}^{\mathrm{3}+}$O₄[(Fe${}_{\mathrm{10}}^{\mathrm{3}+}$Si₂)O₃₆]

• Parsa Mountain, eastern part of the Hatrurim Basin, Negev Desert, ca. 10 km southeast of Arad, Israel (31^∘12.3^′ N, 35^∘17.1^′ E)

• Biljana Krüger*, Hannes Krüger, Irina O. Galuskina, Evgeny V. Galuskin, and Yevgeny Vapnik

• *E-mail: biljana.krueger@uibk.ac.at

• Sapphirine supergroup

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

• a=10.5662(1), b=10.9497(1), c=9.08459(7) Å, α=106.4300(8), β=95.7466(7), γ=124.298(1)^∘

• 3.001(49), 2.999(52), 2.733(60), 2.731(58), 2.596(100), 2.593(81), 2.591(79), 1.523(49)

• Type material is deposited in the collections of the Fersman Mineralogical Museum, Russian Academy of Sciences, Leninskiy Prospekt 18-2, Moscow 119071, Russia, registration number 5296/1

• How to cite: Krüger, B., Krüger, H., Galuskina, I. O., Galuskin E. V., and Vapnik, Y.: Devilliersite, IMA 2020-073, in: CNMNC Newsletter 59, Eur. J. Mineral., 33, https://doi.org/10.5194/ejm-33-139-2021, 2021.

IMA no. 2020-074

• Uranoclite

• (UO₂)₂(OH)₂Cl₂(H₂O)₄

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

• Anthony R. Kampf*, Jakub Plášil, Travis A. Olds, Barbara P. Nash, and Joe Marty

• *E-mail: akampf@nhm.org

• Known synthetic analogue

• Monoclinic: P2₁/n

• a=10.763(8), b=6.156(8), c=17.798(8) Å, β=95.656(15)^∘

• 8.85(38), 5.340(100), 5.051(63), 4.421(83), 3.781(38), 3.586(57), 2.828(33), 2.005(37)

• Cotype material is deposited in the mineralogical collections of the Natural History Museum of Los Angeles County, 900 Exposition Boulevard, Los Angeles, CA 90007, USA, catalogue numbers 75101 and 75102

• How to cite: Kampf, A. R., Plášil, J., Olds, T. A., Nash, B. P., and Marty, J.: Uranoclite, IMA 2020-074, in: CNMNC Newsletter 59, Eur. J. Mineral., 33, https://doi.org/10.5194/ejm-33-139-2021, 2021.

IMA no. 2020-075

• Kenoargentotetrahedrite-(Zn)

• Ag₆(Cu₄Zn₂)Sb₄S₁₂□

• Yindongpo mine, Weishancheng ore field, Tongbai Co., Nanyang, Henan Province, China (32^∘33^′02^′′ N, 113^∘25^′25^′′ E)

• Kai Qu*, Xianzhang Sima, Xiangpin Gu, Weizhi Sun, Guang Fan, Zengqian Hou, Pei Ni, Daming Wang, Zeqiang Yang, and Yanjuan Wang

• *E-mail: qukai_tcgs@foxmail.com

• Tetrahedrite group

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

• a=10.4624(4) Å

• 7.345(6), 3.010(100), 2.792(5), 2.606(22), 2.456(5), 2.046(9), 1.844(30), 1.572(15)

• Type material is deposited in the mineralogical collections of the Geological Museum of China, No. 16 Yangrou Hutong, Xisi, Beijing 100031, People's Republic of China, catalogue number M16112

• How to cite: Qu, K., Sima, X., Gu, X., Sun, W., Fan, G., Hou, Z., Ni, P., Wang, D., Yang, Z., and Wang, Y.: Kenoargentotetrahedrite-(Zn), IMA 2020-075, in: CNMNC Newsletter 59, Eur. J. Mineral., 33, https://doi.org/10.5194/ejm-33-139-2021, 2021.

IMA no. 2020-076

• Zolotarevite

• Na₅Zr[Si₆O₁₅(OH)₃]•3H₂O

• Mt. Alluaiv, Lovozero alkaline massif, Kola Peninsula, Russia (67^∘51^′48^′′ N, 34^∘30^′16^′′ E)

• Julia A. Mikhailova*, Ekaterina A. Selivanova, Sergey V. Krivovichev, Yakov A. Pakhomovsky, and Nikita V. Chukanov

• *E-mail: mikhailova@geoksc.apatity.ru

• Lovozerite group

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

• a=10.294(6), c=13.115(8) Å

• 7.37(69), 5.26(56), 3.686(64), 3.330(79), 3.265(99), 2.640(100), 2.576(60), 1.842(29)

• Type material is deposited in the collection of the Geological and the Mineralogical Museum of the Geological Institute, Kola Science Centre of the Russian Academy of Sciences, 14 Fersman Street, Apatity 184209, Russia, catalogue number GIM 7910

• How to cite: Mikhailova, J. A., Selivanova, E. A., Krivovichev, S. V., Pakhomovsky, Y. A., and Chukanov, N. V.: Zolotarevite, IMA 2020-076, in: CNMNC Newsletter 59, Eur. J. Mineral., 33, https://doi.org/10.5194/ejm-33-139-2021, 2021.

IMA no. 2020-078

• Nitscheite

• (NH₄)₂[(UO₂)₂(SO₄)₃(H₂O)₂]•3H₂O

• Green Lizard mine, Red Canyon, White Canyon District, San Juan Co., Utah, USA (37^∘34^′37.10^′′ N, 110^∘17^′52.80^′′ W)

• Anthony R. Kampf*, Travis A. Olds, Jakub Plášil, Barbara P. Nash, and Joe Marty

• *E-mail: akampf@nhm.org

• New structure type

• Monoclinic: P2${}_{\mathrm{1}}/n$; structure determined

• a=17.3982(4), b=12.8552(3), c=17.405(1) Å,
  β=96.649(7)^∘

• 6.45(100), 5.69(30), 5.24(28), 4.275(33), 4.081(38), 3.214(40), 2.816(52), 2.591(30)

• Cotype material is deposited in the mineralogical collections of the Natural History Museum of Los Angeles County, 900 Exposition Boulevard, Los Angeles, CA 90007, USA, catalogue numbers 75103 and 75104

• How to cite: Kampf, A. R., Olds, T. A., Plášil, J., Nash, B. P., and Marty, J.: Nitscheite, IMA 2020-078, in: CNMNC Newsletter 59, Eur. J. Mineral., 33, https://doi.org/10.5194/ejm-33-139-2021, 2021.

IMA no. 2020-079

• Argentotetrahedrite-(Hg)

• Ag₆(Cu₄Hg₂)Sb₄S₁₃

• Dongping deposit, Baojing Co., Hunan, China (28^∘36^′05.1^′′ N, 109^∘37^′10.8^′′ E)

• Peng Wu, Xiangping Gu*, Kai Qu, Hang Yang, and Yanjuan Wang

• *E-mail: guxp2004@163.com

• Tetrahedrite group

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

• a=10.6511(2) Å

• 4.356(9), 3.065(100), 2.661(20), 2.505(7), 2.085(9), 1.934(9), 1.881(34), 1.603(17)

• Type material is deposited in the mineralogical collections of the Geological Museum of China, No. 16 Yangrou Hutong, Xisi, Beijing 100031, People's Republic of China, catalogue number M16114

• How to cite: Wu, P., Gu, X., Qu, K., Yang, H., and Wang, Y.: Argentotetrahedrite-(Hg), IMA 2020-079, in: CNMNC Newsletter 59, Eur. J. Mineral., 33, https://doi.org/10.5194/ejm-33-139-2021, 2021.

IMA no. 2020-038a

• Parahibbingite

• Fe${}_{\mathrm{2}}^{\mathrm{2}+}$(OH)₃Cl

• Karee mine, Rustenburg District, Bushveld complex, South Africa (25^∘40^′17^′′ S, 27^∘28^′17^′′ E)

• Peter Koděra*, Juraj Majzlan, Kilian Pollok, Stefan Kiefer, František Šimko, Jarmila Luptáková, and Grant Cawthorn

• *E-mail: kodera1@uniba.sk

• A dimorph of hibbingite

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

• a=6.94(5), c=14.5(2) Å

• 5.55(42), 2.94(22), 2.82(62), 2.31(100), 1.85(17), 1.73(36), 1.66(8), 1.53(15)

• Type material is deposited in the collections of the Mineralogical Museum, Comenius University, Ilkovičova 6, Bratislava 84215, Slovakia, catalogue number 7601

• How to cite: Koděra, P., Majzlan, J., Pollok, K., Kiefer, S., Šimko, F., Luptáková, J., and Cawthorn, G.: Parahibbingite, IMA 2020-038a, in: CNMNC Newsletter 59, Eur. J. Mineral., 33, https://doi.org/10.5194/ejm-33-139-2021, 2021.

3.1 Petrovite

A paper on the new mineral petrovite has been recently published (Mineral. Mag., 84, 691–698, 2020) in which the ideal chemical formula of the mineral is given as Na₁₀CaCu₂(SO₄)₈. With respect to the previously accepted formula Na₈(NaCu)Cu₂Na(SO₄)₈ (cf. CNMNC Newsletter 52), Ca has the status of species-forming constituent and is partitioned at one of the six independent Na sites. After a careful consideration by the officers of the CNMNC, it turned out that Na₁₀CaCu₂(SO₄)₈ can not be an end-member formula for the mineral. In fact, it is an intermediate between the two compositions Na₁₂Cu₂(SO₄)₈ and Na₈□₂Ca₂Cu₂(SO₄)₈, which correspond to the two end-members (with x=0 and x=1, respectively), of the general formula CuNa_6−2xCa_x(SO₄)₄, where $\mathrm{0}\le x\le \mathrm{1}$. Examination of site occupancies indicates a structural formula Na₈(Na_0.53Ca_0.47)₂(Na_0.53□_0.47)₂Cu₂(SO₄)₈, which shows a ${\mathrm{Na}}^{+}+{\mathrm{Na}}^{+}={\mathrm{Ca}}^{\mathrm{2}+}+\mathit{\square }$ substitution mechanism. However, sodium is the dominant cation at all Na sites of the structure; therefore, the ideal formula of petrovite should correspond to the formula of the predominant, Ca-free end-member constituent, Na₁₂Cu₂(SO₄)₈. The official IMA List of Minerals has been modified accordingly.

3.2 Chiyokoite

A paper on the new mineral chiyokoite has been recently published (Can. Mineral., 58, 653–662, 2020) in which the ideal chemical formula of the mineral is given as Ca₃Si(CO₃)[B(OH)₄]O(OH)₅•12H₂O. With respect to the previously accepted formula, arsenic is not an essential constituent anymore. Actually, the chemical and crystallographic data show that arsenic, in the form of the complex anion (AsO₃)³⁻, is a subordinate constituent in the channels of the structure. These data were examined carefully by the CNMNC officers and were considered reliable. Accordingly, it was agreed to modify the formula of chiyokoite in the official IMA List of Minerals.