Newsletter 61

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

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 web site.

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 2021

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: [email protected]

• 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. (2021) Liguowuite, IMA 2020-097. CNMNC Newsletter 61; Mineralogical Magazine, 85, https://doi.org/10.1180/mgm.2021.48

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: [email protected]

• The Fe-dominant analogue of kuvaevite

• Trigonal: R $\overline 3$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. (2021) Tamuraite, IMA 2020-098. CNMNC Newsletter 61; Mineralogical Magazine, 85, https://doi.org/10.1180/mgm.2021.48

IMA No. 2020-099

• Garpenbergite

• Mn₆□AsSbO₁₀(OH)₂

• Garpenberg, Hedemora, Dalarna County, Sweden

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

• *E-mail: [email protected]

• 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, SE-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. (2021) Garpenbergite, IMA 2020-099. CNMNC Newsletter 61; Mineralogical Magazine, 85, https://doi.org/10.1180/mgm.2021.48

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: [email protected]

• 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. (2021) Paratobermorite, IMA 2020-100. CNMNC Newsletter 61; Mineralogical Magazine, 85, https://doi.org/10.1180/mgm.2021.48

IMA No. 2020-102

• Relianceite-(K)

• K₄Mg(V⁴⁺O)₂(C₂O₄)(PO₃OH)₄(H₂O)₁₀

• 125-foot level of the Rowley mine, ca. 20 km NW 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: [email protected]

• 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. (2021) Relianceite-(K), IMA 2020-102. CNMNC Newsletter 61; Mineralogical Magazine, 85, https://doi.org/10.1180/mgm.2021.48

IMA No. 2020-103

• Dendoraite-(NH₄)

• (NH₄)₂NaAl(C₂O₄)(PO₃OH)₂(H₂O)₂

• 125-foot level of the Rowley mine, ca. 20 km NW 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: [email protected]

• 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. (2021) Dendoraite-(NH₄), IMA 2020-103. CNMNC Newsletter 61; Mineralogical Magazine, 85, https://doi.org/10.1180/mgm.2021.48

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: [email protected]

• Tetrahedrite group

• Cubic: I $\overline 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 Praha 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. (2021) Stibiogoldfieldite, IMA 2020-104. CNMNC Newsletter 61; Mineralogical Magazine, 85, https://doi.org/10.1180/mgm.2021.48

IMA No. 2021-001

• Hydroxylbastnäsite-(La)

• La(CO₃)(OH)

• Vuoriyarvi alkaline-ultrabasic complex, Murmansk Oblast’, Northern Karelia (near the border with Kola Peninsula), Russia (holotype); Mochalin Log REE deposit, 14 km N 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: [email protected]

• Bastnäsite group

• Hexagonal: P $\overline 6$; 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. (2021) Hydroxylbastnäsite-(La), IMA 2021-001. CNMNC Newsletter 61; Mineralogical Magazine, 85, https://doi.org/10.1180/mgm.2021.48

IMA No. 2019-107c

• Wenjiite

• Ti₁₀Si_xP_y     x > y, 6 ≤ (x + y) ≤ 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: [email protected]

• 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. (2021) Wenjiite, IMA 2019-107c. CNMNC Newsletter 61; Mineralogical Magazine, 85, https://doi.org/10.1180/mgm.2021.48

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: [email protected]

• 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. (2021) Kangjinlaite, IMA 2019-112b. CNMNC Newsletter 61; Mineralogical Magazine, 85, https://doi.org/10.1180/mgm.2021.48

IMA No. 2020-095a

• Beershevaite

• CaFe³⁺₃(PO₄)₃O

• In paralavas of the Halamish Wadi, Hatrurim basin, south 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: [email protected]

• 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. (2021) Beershevaite, IMA 2020-095a. CNMNC Newsletter 61; Mineralogical Magazine, 85, https://doi.org/10.1180/mgm.2021.48

NEW MINERAL PROPOSALS APPROVED IN MAY 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: [email protected]

• New structure type

• Triclinic: P $\overline 1$; 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. (2021) Karlditmarite, IMA 2021-003. CNMNC Newsletter 61; Mineralogical Magazine, 85, https://doi.org/10.1180/mgm.2021.48

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: [email protected]

• 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. (2021) Milkovoite, IMA 2021-005. CNMNC Newsletter 61; Mineralogical Magazine, 85, https://doi.org/10.1180/mgm.2021.48

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: [email protected]

• Cancrinite group

• Hexagonal: P $\overline 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. (2021) Steudelite, IMA 2021-007. CNMNC Newsletter 61; Mineralogical Magazine, 85, https://doi.org/10.1180/mgm.2021.48

IMA No. 2021-010

• Oberwolfachite

• SrFe³⁺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: [email protected]

• Alunite supergroup

• Trigonal: R $\overline 3$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. CNMNC Newsletter 61; Mineralogical Magazine, 85, https://doi.org/10.1180/mgm.2021.48

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: [email protected]

• 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. (2021) Ryabchikovite, IMA 2021-011. CNMNC Newsletter 61; Mineralogical Magazine, 85, https://doi.org/10.1180/mgm.2021.48

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: [email protected]

• The Ni analogue of anastasenkoite

• Triclinic: P $\overline 1$; 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. (2021) Lisanite, IMA 2021-014. CNMNC Newsletter 61; Mineralogical Magazine, 85, https://doi.org/10.1180/mgm.2021.48

IMA No. 2021-016

• Erssonite

• CaMg₇Fe³⁺₂(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: [email protected]

• Hydrotalcite supergroup

• Trigonal: P $\overline 3$c1; 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, SE-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. (2021) Erssonite, IMA 2021-016. CNMNC Newsletter 61; Mineralogical Magazine, 85, https://doi.org/10.1180/mgm.2021.48

CONFIRMATION OF SIDERAZOT AS A VALID SPECIES

In the IMA List of Minerals siderazot is tagged as Q (= questionable), for the reason that no data on that mineral have been published since the original description [Ann. Phys. Chem., 157 (1876), 165–172]. Recently a detailed study on holotype siderazot, which is preserved in the Natural History Museum, London (UK), was carried out [Minerals, 11 (2021), art. 290]. New chemical (EMPA) and structural (Rietveld) data were obtained. Moreover Raman and reflectance data are given. The complete set of data indicate that siderazot possesses the ε-Fe₃N-type structure. In the light of these new data the status of siderazot can be changed from Q to Rd (= redefined). The chemical formula of siderazot is slightly modified from FeN_x (with x ≈ 0.25–0.5) to Fe₃N_1.33.

NOMENCLATURE/CLASSIFICATION PROPOSALS APPROVED IN MAY 2021

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.

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.

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.

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 in the CNMNC website. Mineral symbols will now be required in all new mineral proposals.