IMA no. 2020-097

• Liguowuite

• WO₃

• Nanyang Village, Huaping County, Yunnan Province, Panzhihua-Xichang region, China (26^∘46^′18.21^′′ N, 101^∘27^′13.86^′′ E)

• Yuan Xue*, Ningyue Sun, Hongping He, Aiqing Chen, and Yiping Yang

• *E-mail: xue.yuea@163.com

• Known synthetic analogue

• Monoclinic: P2₁/n; structure determined

• a=7.3258(2), b=7.5477(2), c=7.7113(2) Å, β=90.678(3)^∘

• 3.855(88), 3.768(88), 3.659(100), 3.104(20), 2.693(43), 2.626(60), 1.827(32), 1.645(27)

• Type material is deposited in the mineralogical collections of the Geological Museum of China, Xisi, Yangrou Hutong No. 15, Beijing 100083, People's Republic of China, catalogue number M16121 (holotype), and the Crystal Structure Laboratory, China University of Geosciences, Beijing 100083, People's Republic of China, catalogue number NY-5-3Z (cotype)

• How to cite: Xue, Y., Sun, N., He, H., Chen, A., and Yang, Y.: Liguowuite, IMA 2020-097, in: CNMNC Newsletter 61, Eur. J. Mineral., 33, https://doi.org/10.5194/ejm-33-299-2021, 2021.

IMA no. 2020-098

• Tamuraite

• Ir₅Fe₁₀S₁₆

• Sisim Placer Zone, river Sisim basin, southern portion of Krasnoyarskiy Kray, central Siberia, not far from Krasnoyarsk, southwestern Eastern Sayans, Russia

• Andrei Y. Barkov*, Nadezhda D. Tolstykh, and Robert F. Martin

• *E-mail: ore-minerals@mail.ru

• The Fe-dominant analogue of kuvaevite

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

• a=7.073(1), c=34.277(8) Å

• 5.774(45), 3.053(43), 3.011(100), 2.996(50), 2.799(55), 2.495(38), 1.770(71), 1.758(65)

• Type material is deposited in the mineralogical collections of the Central Siberian Geological Museum, Sobolev Institute of Geology and Mineralogy, Akademik Koptyug Avenue no. 3, 630090 Novosibirsk, Russia, catalogue number III-102/2

• How to cite: Barkov, A. Y., Tolstykh, N. D., and Martin, R. F.: Tamuraite, IMA 2020-098, in: CNMNC Newsletter 61, Eur. J. Mineral., 33, https://doi.org/10.5194/ejm-33-299-2021, 2021.

IMA no. 2020-099

• Garpenbergite

• Mn₆AsSbO₁₀(OH)₂

• Garpenberg, Hedemora, Dalarna County, Sweden

• Dan Holtstam*, Luca Bindi, Hans-Jürgen Förster, Andreas Karlsson, and Kjell Gatedal

• *E-mail: dan.holtstam@nrm.se

• The Mn-deficient analogue of manganostibite

• Orthorhombic: Ibmm; structure determined

• a=8.6790(9), b=18.906(2), c=6.1066(6) Å

• 5.00(25), 4.42(30), 3.48(20), 3.050(30), 2.665(100), 2.616(40), 2.586(25), 1.545(45)

• Type material is deposited in the mineralogical collections of the Department of Geosciences, Swedish Museum of Natural History, Box 50007, 10405 Stockholm, Sweden, collection number GEO-NRM #20010351 and #20200040

• How to cite: Holtstam, D., Bindi, L., Förster, H.-J., Karlsson, A., and Gatedal, K.: Garpenbergite, IMA 2020-099, in: CNMNC Newsletter 61, Eur. J. Mineral., 33, https://doi.org/10.5194/ejm-33-299-2021, 2021.

IMA no. 2020-100

• Paratobermorite

• Ca₄(Al_0.5Si_0.5)₂Si₄O₁₆(OH)(H₂O)₂•(Ca•3H₂O)

• Southern open pit, Bazhenovskoe deposit, Asbest, Sverdlovsk Oblast, Central Urals, Russia

• Igor V. Pekov*, Natalia V. Zubkova, Nikita V. Chukanov, Stefano Merlino, Vasiliy O. Yapaskurt, Dmitry I. Belakovskiy, Alexander B. Loskutov, Elena A. Novgorodova, Svetlana A. Vozchikova, Sergey N. Britvin, and Dmitry Y. Pushcharovsky

• *E-mail: igorpekov@mail.ru

• Tobermorite supergroup

• Monoclinic: C112₁/m; structure determined

• a=11.2220(4), b=7.3777(2), c=22.9425(8) Å, γ=89.990(3)^∘

• 11.52(100), 5.46(24), 3.562(17), 3.088(51), 2.982(50), 2.838(20), 2.013(14), 1.848(22)

• 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 5643/1

• How to cite: Pekov, I. V., Zubkova, N. V., Chukanov, N. V., Merlino, S., Yapaskurt, V. O., Belakovskiy, D. I., Loskutov, A. B., Novgorodova, E. A., Vozchikova, S. A., Britvin, S. N., and Pushcharovsky, D. Y.: Paratobermorite, IMA 2020-100, in: CNMNC Newsletter 61, Eur. J. Mineral., 33, https://doi.org/10.5194/ejm-33-299-2021, 2021.

IMA no. 2020-102

• Relianceite-(K)

• K₄Mg(V⁴⁺O)₂(C₂O₄)(PO₃OH)₄(H₂O)₁₀

• 125-foot (38.1 m) level of the Rowley mine, ca. 20 km northwest of Theba, Maricopa Co., Arizona, USA (33^∘02^′57^′′ N, 113^∘01^′59^′′ W)

• Anthony R. Kampf*, Mark A. Cooper, Aaron J. Celestian, Chi Ma, and Joe Marty

• *E-mail: akampf@nhm.org

• New structure type

• Monoclinic: Pc; structure determined

• a=12.404(7), b=9.014(6), c=13.260(8) Å, β=100.80(1)^∘

• 12.22(100), 6.56(21), 6.28(20), 3.435(19), 3.125(23), 3.039(19), 2.893(22), 2.718(21)

• 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 75275

• How to cite: Kampf, A. R., Cooper, M. A., Celestian, A. J., Ma, C., and Marty, J.: Relianceite-(K), IMA 2020-102, in: CNMNC Newsletter 61, Eur. J. Mineral., 33, https://doi.org/10.5194/ejm-33-299-2021, 2021.

IMA no. 2020-103

• Dendoraite-(NH₄)

• (NH₄)₂NaAl(C₂O₄)(PO₃OH)₂(H₂O)₂

• 125-foot (38.1 m) level of the Rowley mine, ca. 20 km northwest of Theba, Maricopa Co., Arizona, USA (33^∘02^′57^′′ N, 113^∘01^′59^′′ W)

• Anthony R. Kampf*, Mark A. Cooper, Aaron J. Celestian, Chi Ma, and Joe Marty

• *E-mail: akampf@nhm.org

• New structure type

• Monoclinic: P2₁/n; structure determined

• a=10.695(6), b=6.285(4), c=19.227(12) Å, β=90.93(1)^∘

• 9.65(100), 9.29(54), 5.99(24), 4.738(28), 3.455(40), 3.106(75), 2.975(28), 2.828(33)

• 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 75275

• How to cite: Kampf, A. R., Cooper, M. A., Celestian, A. J., Ma, C., and Marty, J.: Dendoraite-(NH₄), IMA 2020-103, in: CNMNC Newsletter 61, Eur. J. Mineral., 33, https://doi.org/10.5194/ejm-33-299-2021, 2021.

IMA no. 2020-104

• Stibiogoldfieldite

• Cu₆Cu₆(Sb₂Te₂)S₁₃

• Mohawk mine, Goldfield mining district, Esmeralda Co., Nevada, USA (37^∘43^′01^′′ N, 117^∘13^′25^′′ W)

• Cristian Biagioni*, Jiri Sejkora, Silvia Musetti, Emil Makovicky, Renato Pagano, Marco Pasero, and Zdeněk Dolníček

• *E-mail: cristian.biagioni@unipi.it

• Tetrahedrite group

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

• a=10.347(2) Å

• 3.644(19), 2.974(100), 2.754(8), 2.576(19), 2.429(7), 2.020(10), 1.821(32), 1.553(13)

• Type material is deposited in the mineralogical collections of the Museo di Storia Naturale, Università di Pisa, Via Roma 79, Calci (PI), Italy, catalogue number 19926 (holotype), and the Department of Mineralogy and Petrology, National Museum in Prague, Cirkusová 1740, 19300 Prague 9, Czech Republic, catalogue numbers P1P 78/2020 (holotype) and P1P 80/2020 (cotype)

• How to cite: Biagioni, C., Sejkora, J., Musetti, S., Makovicky, E., Pagano, R., Pasero, M., and Dolníček, Z.: Stibiogoldfieldite, IMA 2020-104, in: CNMNC Newsletter 61, Eur. J. Mineral., 33, https://doi.org/10.5194/ejm-33-299-2021, 2021.

IMA no. 2021-001

• Hydroxylbastnäsite-(La)

• La(CO₃)(OH)

• Vuoriyarvi alkaline-ultrabasic complex, Murmansk Oblast, North Karelia (near the border with Kola Peninsula), Russia (holotype); Mochalin Log REE deposit, 14 km north of Kyshtym, Chelyabinsk Oblast, South Urals, Russia (55^∘48^′42^′′ N, 60^∘33^′46^′′ E – cotype)

• Igor V. Pekov*, Natalia V. Zubkova, Anatoly V. Kasatkin, Nikita V. Chukanov, Natalia N. Koshlyakova, Dmitry A. Ksenofontov, Radek Škoda, Sergey N. Britvin, Anatoly S. Kirillov, Anatoly N. Zaitsev, Aleksey M. Kuznetsov, and Dmitry Y. Pushcharovsky

• *E-mail: igorpekov@mail.ru

• Bastnäsite group

• Hexagonal: $P\stackrel{\mathrm{‾}}{\mathrm{6}}$; structure determined

• a=12.537(3), c=9.968(2) Å

• 4.98(39), 3.616(88), 2.926(100), 2.089(41), 2.052(46), 1.927(40), 1.701(24), 1.319(20)

• Type material is deposited in the collections of the Fersman Mineralogical Museum, Russian Academy of Sciences, Leninskiy Prospekt 18-2, Moscow 119071, Russia, registration numbers 5644/1 (holotype) and 5660/1 (cotype)

• How to cite: Pekov, I. V., Zubkova, N. V., Kasatkin, A. V., Chukanov, N. V., Koshlyakova, N. N., Ksenofontov, D. A., Škoda, R., Britvin, S. N., Kirillov, A. S., Zaitsev, A. N., Kuznetsov, A. M., and Pushcharovsky, D. Y.: Hydroxylbastnäsite-(La), IMA 2021-001, in: CNMNC Newsletter 61, Eur. J. Mineral., 33, https://doi.org/10.5194/ejm-33-299-2021, 2021.

IMA no. 2019-107c

• Wenjiite

• Ti₁₀Si_xP_y  x>y, $\mathrm{6}\le (x+y)\le \mathrm{7}$

• Cr-11 orebody, Luobusa ophiolite, about 200 km east-southeast of Lhasa, Kangjinla District, Tibet, China (29^∘11^′ N, 92^∘18^′ E; 5300 m a.s.l.)

• Fahui Xiong*, Xiangzhen Xu, Enrico Mugnaioli, Mauro Gemmi, Richard Wirth, Jingsui Yang, and Edward S. Grew

• *E-mail: xiongfahui@126.com

• Isostructural with mavlyanovite and xifengite

• Hexagonal: P6₃/mcm; structure determined

• a=7.3(1), c=5.1(1) Å

• 2.54(11), 2.39(31), 2.36(17), 2.16 (100), 2.11(39), 2.09(80), 1.48(17), 1.38(19)

• 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 M16104

• How to cite: Xiong, F., Xu, X., Mugnaioli, E., Gemmi, M., Wirth, R., Yang, Y., and Grew, E. S.: Wenjiite, IMA 2019-107c, in: CNMNC Newsletter 61, Eur. J. Mineral., 33, https://doi.org/10.5194/ejm-33-299-2021, 2021.

IMA no. 2019-112b

• Kangjinlaite

• Ti₁₁Si₁₀

• Cr-11 orebody, Luobusa ophiolite, about 200 km east-southeast of Lhasa, Kangjinla District, Tibet, China (29^∘11^′ N, 92^∘18^′ E; 5300 m a.s.l.)

• Fahui Xiong*, Xiangzhen Xu, Enrico Mugnaioli, Mauro Gemmi, Richard Wirth, Edward S. Grew, and Jingsui Yang

• *E-mail: xiongfahui@126.com

• Isostructural with synthetic Ho₁₁Ge₁₀

• Tetragonal: I4/mmm; structure determined

• a=9.4(2), c=13.5(3) Å

• 2.36(34), 2.28(87), 2.27(100), 2.24(35), 2.23(68), 2.12(22), 2.05(37), 1.58(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 M16104

• How to cite: Xiong, F., Xu, X., Mugnaioli, E., Gemmi, M., Wirth, R., Grew, E. S., and Yang, Y.: Kangjinlaite, IMA 2019-112b, in: CNMNC Newsletter 61, Eur. J. Mineral., 33, https://doi.org/10.5194/ejm-33-299-2021, 2021.

IMA no. 2020-095a

• Beershevaite

• CaFe${}_{\mathrm{3}}^{\mathrm{3}+}$(PO₄)₃O

• In paralavas of the Halamish Wadi, Hatrurim basin, southern Negev Desert, Israel (31^∘09^′47^′′ N, 35^∘17^′57^′′ E)

• Sergey N. Britvin*, Mikhail N. Murashko, Maria G. Krzhizhanovskaya, Yevgeny Vapnik, Natalia S. Vlasenko, Oleg S. Vereshchagin, Vladimir N. Bocharov, and Evgeny A. Vasiliev

• *E-mail: sbritvin@gmail.com

• Known synthetic analogue

• Monoclinic: P2₁/m; structure determined

• a=7.498(5), b=6.356(4), c=10.128(7) Å, β=99.88(1)^∘

• 10.08(39), 4.52(100), 3.85(72), 3.696(98), 3.182(95), 2.947(91), 2.865(48), 2.756(42)

• 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 5628/1

• How to cite: Britvin, S. N., Murashko, M. N., Krzhizhanovskaya, M. G., Vapnik, Y., Vlasenko, N. S., Vereshchagin, O. S., Bocharov, V. N., and Vasiliev, E. A.: Beershevaite, IMA 2020-095a, in: CNMNC Newsletter 61, Eur. J. Mineral., 33, https://doi.org/10.5194/ejm-33-299-2021, 2021.

IMA no. 2021-003

• Karlditmarite

• Cu₉O₄(PO₄)₂(SO₄)₂

• Arsenatnaya fumarole, second scoria cone of the Northern Breakthrough of the Great Tolbachik fissure eruption, Tolbachik volcano, Kamchatka, Far Eastern Region, Russia (55^∘41^′ N, 160^∘14^′ E; 1200 m a.s.l.)

• Oleg I. Siidra*, Evgeny V. Nazarchuk, Leonid A. Pautov, Artem S. Borisov, and Evgeniya Y. Avdontseva

• *E-mail: o.siidra@spbu.ru

• New structure type

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

• a=6.1256(7), b=7.9192(8), c=7.9866(8) Å, α=75.173(2), β=86.639(2), γ=88.660(2)^∘

• 7.72(100), 6.28(37), 4.769(25), 4.262(31), 3.750(22), 3.310(26), 3.283(31), 3.199(18)

• 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 5589/1

• How to cite: Siidra, O. I., Nazarchuk, E. V., Pautov, L. A., Borisov, A. S., and Avdontseva, E. Y.: Karlditmarite, IMA 2021-003, in: CNMNC Newsletter 61, Eur. J. Mineral., 33, https://doi.org/10.5194/ejm-33-299-2021, 2021.

IMA no. 2021-005

• Milkovoite

• Cu₄O(PO₄)(AsO₄)

• Arsenatnaya fumarole, second scoria cone of the Northern Breakthrough of the Great Tolbachik fissure eruption, Tolbachik volcano, Kamchatka, Far Eastern Region, Russia (55^∘41^′ N, 160^∘14^′ E; 1200 m a.s.l.)

• Oleg I. Siidra*, Evgeny V. Nazarchuk, Leonid A. Pautov, Artem S. Borisov, and Michael S. Kozin

• *E-mail: o.siidra@spbu.ru

• The P-As analogue of kozyrevskite

• Orthorhombic: Pnma; structure determined

• a=8.1865(7), b=6.3559(5), c=13.668(1) Å

• 3.413(100), 3.156(48), 3.043(82), 2.897(31), 2.868(42), 2.709(80), 2.684(42), 1.859(35)

• 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 5590/1

• How to cite: Siidra, O. I., Nazarchuk, E. V., Pautov, L. A., Borisov, A. S., and Kozin, M. S.: Milkovoite, IMA 2021-005, in: CNMNC Newsletter 61, Eur. J. Mineral., 33, https://doi.org/10.5194/ejm-33-299-2021, 2021.

IMA no. 2021-007

• Steudelite

• Na₃(K₁₇Ca₇)Ca₄(Al₂₄Si₂₄O₉₆)(SO₃)₆F₆•4H₂O

• Biachella Valley, Sacrofano Caldera, Sacrofano (RM), Latium, Italy

• Nikita V. Chukanov*, Natalia V. Zubkova, Dmitry A. Varlamov, Igor V. Pekov, Dmitry I. Belakovskiy, Sergey N. Britvin, Konstantin V. Van, Vera N. Ermolaeva, Svetlana A. Vozchikova, and Dmitry Y. Pushcharovsky

• *E-mail: nikchukanov@yandex.ru

• Cancrinite group

• Hexagonal: $P\stackrel{\mathrm{‾}}{\mathrm{6}}$2c; structure determined

• a=12.8953(1), c=21.2778(3) Å

• 11.15(28), 4.799(25), 3.973(16), 3.721(47), 3.305(100), 2.661(17), 2.471(14), 2.149(21)

• 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 5665/1

• How to cite: Chukanov, N. V., Zubkova, N. V., Varlamov, D. A., Pekov, I. V., Belakovskiy, D. I., Britvin, S. N., Van, K. V., Ermolaeva, V. N., Vozchikova, S. A., and Pushcharovsky, D. Y.: Steudelite, IMA 2021-007, in: CNMNC Newsletter 61, Eur. J. Mineral., 33, https://doi.org/10.5194/ejm-33-299-2021, 2021.

IMA no. 2021-010

• Oberwolfachite

• SrFe${}_{\mathrm{3}}^{\mathrm{3}+}$(AsO₄)(SO₄)(OH)₆

• Clara mine, Oberwolfach baryte mining area, Wolfach, Schwarzwald (Black Forest), Baden-Württemberg, Germany (48^∘22^′46^′′ N, 8^∘13^′44^′′ E)

• Nikita V. Chukanov*, Natalia V. Zubkova, Gerhard Möhn, Dmitry A. Varlamov, Igor V. Pekov, Dmitry A. Ksenofontov, Atali A. Agakhanov, Sergey N. Britvin, Natalia N. Koshlyakova, Joy Desor, Vera N. Ermolaeva, and Dmitry Y. Pushcharovsky

• *E-mail: nikchukanov@yandex.ru

• Alunite supergroup

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

• a=7.3270(3), c=17.0931(9) Å

• 5.95(56), 3.664(37), 3.117(16), 3.082(100), 2.548(15), 2.280(22), 1.983(26), 1.832(19)

• 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 5674/1

• How to cite: Chukanov, N. V., Zubkova, N. V., Möhn, G., Varlamov, D. A., Pekov, I. V., Ksenofontov, D. A., Agakhanov, A. A., Britvin, S. N., Koshlyakova, N. N., Desor, J., Ermolaeva, V. N., and Pushcharovsky, D. Y. (2021) Oberwolfachite, IMA 2021-010, in: CNMNC Newsletter 61, Eur. J. Mineral., 33, https://doi.org/10.5194/ejm-33-299-2021, 2021.

IMA no. 2021-011

• Ryabchikovite

• CuMgSi₂O₆

• Arsenatnaya fumarole, second scoria cone of the Northern Breakthrough of the Great Tolbachik fissure eruption, Tolbachik volcano, Kamchatka, Far Eastern Region, Russia (55^∘41^′ N, 160^∘14^′ E; 1200 m a.s.l.)

• Nadezhda V. Shchipalkina*, Oleg S. Vereshchagin, Igor V. Pekov, Dmitry I. Belakovskiy, Natalia N. Koshlyakova, Vladimir V. Shilovskikh, Dmitriy V. Pankin, Sergey N. Britvin, Fedor D. Sandalov, and Evgeny G. Sidorov

• *E-mail: estel58@yandex.ru

• Pyroxene group

• Monoclinic: P2₁/c

• a=9.731(9), b=8.929(8), c=5.221(4) Å, β=110.00(6)^∘

• 4.403(38), 4.307(27), 3.746(32), 3.291(27), 3.177(100), 2.876(75), 2.456(26), 2.215(26)

• 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 5642/1

• How to cite: Shchipalkina, N. V., Vereshchagin, O. S., Pekov, I. V., Belakovskiy, D. I., Koshlyakova, N. N., Shilovskikh, V. V., Pankin, D. V., Britvin, S. N., Sandalov, F. D., and Sidorov, E. G.: Ryabchikovite, IMA 2021-011, in: CNMNC Newsletter 61, Eur. J. Mineral., 33, https://doi.org/10.5194/ejm-33-299-2021, 2021.

IMA no. 2021-014

• Lisanite

• CaNiP₂O₇

• Halamish Wadi (Nahal Halamish), Hatrurim basin, Negev Desert, Israel (31^∘09^′47^′′ N, 35^∘17^′57^′′ E)

• Sergey N. Britvin*, Michail N. Murashko, Yevgeny Vapnik, Natalia S. Vlasenko, Oleg S. Vereshchagin, and Vladimir N. Bocharov

• *E-mail: sbritvin@gmail.com

• The Ni analogue of anastasenkoite

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

• a=6.474(2), b=6.526(2), c=6.519(2) Å, α=66.57(3), β=82.77(2), γ=87.35(2)^∘

• 4.389(13), 3.214(21), 3.029(51), 2.994(45), 2.970(17), 2.835(100), 2.718(8), 1.772(10)

• 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 5629/1

• How to cite: Britvin, S. N., Murashko, M. N., Vapnik, Y., Vlasenko, N. S., Vereshchagin, O. S., and Bocharov, V. N.: Lisanite, IMA 2021-014, in: CNMNC Newsletter 61, Eur. J. Mineral., 33, https://doi.org/10.5194/ejm-33-299-2021, 2021.

IMA no. 2021-016

• Erssonite

• CaMg₇Fe${}_{\mathrm{2}}^{\mathrm{3}+}$(OH)₁₈(SO₄)₂•12H₂O

• Långban mine, Filipstad district, Värmland county, Sweden (59^∘51^′19^′′ N, 14^∘15^′53^′′ E)

• Elena S. Zhitova*, Nikita V. Chukanov, Erik Jonsson, Igor V. Pekov, Dmitry I. Belakovsky, Marina F. Vigasina, Natalia V. Zubkova, Konstantin V. Van, and Sergey N. Britvin

• *E-mail: zhitova_es@mail.ru

• Hydrotalcite supergroup

• Trigonal: $P\stackrel{\mathrm{‾}}{\mathrm{3}}c$1; structure determined

• a=9.3550(5), c=22.546(1) Å

• 11.22(90), 5.63(64), 4.670(100), 3.756(35), 2.626(64), 2.435(66), 2.193(40), 1.951(45)

• 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 5669/1, and the Swedish Museum of Natural History (Naturhistoriska Riksmuseet), P.O. Box 50007, 104 05 Stockholm, Sweden, catalogue number GEO-NRM #20210001

• How to cite: Zhitova, E. S., Chukanov, N. V., Jonsson, E., Pekov, I. V., Belakovsky, D. I., Vigasina, M. F., Zubkova, N. V., Van, K. V., and Britvin, S. N.: Erssonite, IMA 2021-016, in: CNMNC Newsletter 61, Eur. J. Mineral., 33, https://doi.org/10.5194/ejm-33-299-2021, 2021.

4.1 IMA 21-A: discreditation of the mineral name hartite and reinstatement of the name branchite

Proposal 21-A is accepted, and the mineral name hartite is discredited and replaced by the name branchite, which has historical priority.

4.2 IMA 21-B: redefinition of gunterite

Proposal 21-B is accepted, and the ideal formula of gunterite is revised from Na₄(H₂O)₁₆(H₂V₁₀O₂₈)•6H₂O to Na₄Ca[V₁₀O₂₈]•20H₂O, based on new structural data and electron-probe microanalyses.

4.3 IMA 21-C: redefinition of jixianite as hydroplumboelsmoreite

Proposal 21-C is accepted, and the questionable species jixianite is renamed hydroplumboelsmoreite. The mineral hydroplumboelsmoreite belongs to the pyrochlore supergroup and has the simplified formula (Pb,)₂(W,Fe³⁺)₂O₆(H₂O). More specifically it belongs to the elsmoreite group (W⁶⁺ dominant at the B site), with Pb dominant at the A site and H₂O dominant at the anionic Y site.

4.4 Mineral symbols

The proposal to establish mineral symbols has been approved. All existing mineral species have been assigned a symbol. The list of current mineral symbols will be available and kept up to date on the CNMNC website. Mineral symbols will now be required in all new mineral proposals.