IMA Commission on New Minerals, Nomenclature and Classification (CNMNC) Newsletter 43: New minerals and nomenclature modifications approved in 2018

IMA No. 2017-115

Fiemmeite

Cu₂(C₂O₄)(OH)₂·2H₂O

Passo di San Lugano, Fiemme Valley, Carano (TN), Italy

Francesco Demartin*, Italo Campostrini, Paolo Ferretti and Ivano Rocchetti

*E-mail: [email protected]

New structure type

Monoclinic: P2₁/c; structure determined

a = 3.4245(6), b = 10.141(2), c = 19.397(3) Å, β = 90.71(1)°

9.71(55), 7.02(28), 5.079(100), 4.501(50), 3.072(58), 2.891(20), 2.730(15), 2.686(25)

Type material is deposited in the mineralogical collections of MUSE – Museo delle Scienze di Trento, Corso del Lavoro e della Scienza 3, I-38122 Trento, Italy, sample no. 5249

How to cite: Demartin, F., Campostrini, I., Ferretti, P. and Rocchetti, I. (2018) Fiemmeite, IMA 2017-115. CNMNC Newsletter No. 43, June 2018, page 647; European Journal of Mineralogy, 30, 647–652.

IMA No. 2017-116

Vaniniite

$Ca2Mn32+Mn23+O2(AsO4)4·2H2O$

Falotta mine, near Rona village, Oberhalbstein valley, Graubünden, Switzerland

Nicolas Meisser*, Remo Widmer, Thomas Armbruster, Radek Škoda, Philippe Roth and Thomas Mumenthaler

*E-mail: [email protected]

New structure type

Monoclinic: P2₁/c; structure determined

a = 8.9856 (1), b = 8.9472(1), c = 9.9039(1) Å, β = 94.719(1)°

5.47(40), 4.31(40), 3.99(50), 3.76(70), 3.18(40), 2.99(100), 1.646(70), 1.580(50)

Type material is deposited in the mineralogical collections of Musée Cantonal de Géologie, University of Lausanne, Anthropole, Dorigny, CH-1015 Lausanne, Switzerland, catalogue number MGL n° 080143 (holotype) and 080144 (cotype)

How to cite: Meisser, N., Widmer, R., Armbruster, T., Škoda, R., Roth, P. and Mumenthaler, T. (2018) Vaniniite, IMA 2017-116. CNMNC Newsletter No. 43, June 2018, page 648; European Journal of Mineralogy, 30, 647–652.

IMA No. 2017-117

Bodieite

$Bi23+(Te4+O3)2(SO4)$

On a dump ca. 0.2 km W of the North Star mine, Tintic district, Juab Co., Utah, USA (39.921298°N, 112.108668°W); Pittsburg-Liberty mine, Masonic district, Mono Co., California, USA (38.358637°N, 119.120321°W)

Anthony R. Kampf*, Robert M. Housley, George R. Rossman, Joe Marty and Marek Chorazewicz

*E-mail: [email protected]

New structure type

Monoclinic: I2/a; structure determined

a = 8.1033(8), b = 7.4302(8), c = 14.695(2) Å, β = 97.771(9)°

7.31(20), 3.331(62), 3.243(100), 3.039(20), 2.716(25), 1.960(15), 1.901(21), 1.662(17)

Cotype material is deposited in the mineralogical collections of the Natural History Museum of Los Angeles County, 900 Exposition Blvd, Los Angeles, California, USA, catalogue numbers 67482 (dump near North Star mine), 67483, 67484, 67485 and 67486 (Pittsburg-Liberty mine)

How to cite: Kampf, A.R., Housley, R.M., Rossman, G.R., Marty, J. and Chorazewicz, M. (2018) Bodieite, IMA 2017-117. CNMNC Newsletter No. 43, June 2018, page 648; European Journal of Mineralogy, 30, 647–652.

IMA No. 2017-118

Jahnsite-(MnMnMg)

Mn²⁺Mn²⁺Mg₂Fe³⁺₂(PO₄)₄(OH)₂·8H₂O

Proberylo, Sapucaia, Galiléia, Minas Gerais, Brazil (18°54′3″S, 41°29′4″W)

Pietro Vignola*, Frédéric Hatert, Maxime Baijot, Nicola Rotiroti, Andrea Risplendente and Sergio Varvello

*E-mail: [email protected]

Jahnsite group

Monoclinic: P2/a; structure determined

a = 15.177(2), b = 7.176(1), c = 10.006(3) Å, β = 111.01(2)°

9.28(100), 4.945(39), 4.627(20), 3.521(43), 2.988(52), 2.842(81), 1.958(27), 1.581(27)

Type material is deposited in the mineralogical collections of the Laboratoire de Minéralogie, University of Liege, Bât. B18, Sart Tilman, B-4000 Liège, Belgium, catalogue no. 21140

How to cite: Vignola, P., Hatert, F., Baijot, M., Rotiroti, N., Risplendente, A. and Varvello, S. (2018) Jahnsite-(MnMnMg), IMA 2017-118. CNMNC Newsletter No. 43, June 2018, page 648; European Journal of Mineralogy, 30, 647–652.

IMA No. 2018-001

Paraberzeliite

NaCa₂Mg₂(AsO₄)₃

Arsenatnaya fumarole, Second scoria cone of the Northern Breakthrough of the Great Tolbachik Fissure Eruption, Tolbachik volcano, Kamchatka peninsula, Far-Eastern Region, Russia (55°41′N, 160°14′E, 1200 m asl)

Igor V. Pekov*, Natalia N. Koshlyakova, Dmitry I. Belakovskiy, Marina F. Vigasina, Natalia V. Zubkova, Atali A. Agakhanov, Sergey N. Britvin, Evgeny G. Sidorov and Dmitry Y. Pushcharovsky

*E-mail: [email protected]

Alluaudite group

Monoclinic: C2/c; structure determined

a = 12.3143(7), b = 13.0679(5), c = 6.7717(4) Å, β = 113.657(7)°

3.642(25), 3.606(17), 3.243(29), 3.096(22), 2.986(34), 2.888(22), 2.822(100), 2.658(29)

Type material is deposited in the collections of the Fersman Mineralogical Museum, Russian Academy of Sciences, Moscow, Russia, registration number 5067/1

How to cite: Pekov, I.V., Koshlyakova, N.N., Belakovskiy, D.I., Vigasina, M.F., Zubkova, N.V., Agakhanov, A.A., Britvin, S.N., Sidorov, E.G. and Pushcharovsky, D.Y. (2018) Paraberzeliite, IMA 2018-001. CNMNC Newsletter No. 43, June 2018, page 648; European Journal of Mineralogy, 30, 647–652.

IMA No. 2018-002

Oyonite

Ag₃Mn₂Pb₄Sb₇As₄S₂₄

Uchucchacua deposit, Oyon district, Catajambo, Lima Department, Peru (10°37′23″S, 76°41′17″W)

Luca Bindi*, Cristian Biagioni and Frank N. Keutsch

*E-mail: [email protected]

Lillianite homeotypic series

Monoclinic: P2₁/n; structure determined

a = 19.181(2), b = 12.775(1), c = 8.179(1) Å, β = 90.47(1)°

3.34(40), 3.29(100), 3.15(30), 2.920(40), 2.860(30), 2.821(70), 2.678(35), 2.045(50)

Type material is deposited in the mineralogical collections of the Museo di Storia Naturale, Sezione di Mineralogia e Litologia, Università di Firenze, Via La Pira 4, I-50121, Firenze, Italy, catalogue number 3283/I

How to cite: Bindi, L., Biagioni, C. and Keutsch, F.N. (2018) Oyonite, IMA 2018-002. CNMNC Newsletter No. 43, June 2018, page 648; European Journal of Mineralogy, 30, 647–652.

IMA No. 2017-069a

Belomarinaite

KNa(SO₄)

Toludskoe lava field, Fissure Tolbachic eruption 2012-2013, Kamchatka peninsula, Far-Eastern Region, Russia (55°45′1.32″N, 160°19′40.74″E, 1480 m asl)

Stanislav K. Filatov*, Andrey P. Shablinskii, Lidiya P. Vergasova, Olga Y. Saprikina, Rimma S. Bubnova, Svetlana V. Moskaleva and Alexander B. Belousov

*E-mail: [email protected]

Chemically and structurally related to aphthitalite

Trigonal: P3m1; structure determined

a = 5.604(1), c = 7.178(2) Å

4.022(31), 3.591(26), 2.884(74), 2.800(100), 2.391(16), 2.296(8), 2.008(38), 1.634(10)

Type material is deposited in the collections of the Mineralogical Museum, Saint-Petersburg State University, University Emb. 7/9, St. Petersburg 199034, Russia, catalogue number 1/19678

How to cite: Filatov, S.K., Shablinskii, A.P., Vergasova, L.P., Saprikina, O.Y., Bubnova, R.S., Moskaleva, S.V. and Belousov, A.B. (2018) Belomarinaite, IMA 2017-069a. CNMNC Newsletter No. 43, June 2018, page 649; European Journal of Mineralogy, 30, 647–652.

IMA No. 2018-003

Uakitite

VN

Iron meteorite Uakit (IIAB, 3.96 kg) found in 2016 in the Baunt Evenk district, Republic of Buryatia, Russia (55°29′47.50″N, 113°33′47.98″E)

Victor V. Sharygin*, German S. Ripp, Grigory A. Yakovlev, Yurii V. Seryotkin, Nikolai S. Karmanov, Ivan A. Izbrodin, Victor I. Grokhovsky and Elena A. Khromova

*E-mail: [email protected]

Known synthetic analogue

Cubic: $Fm3¯m$

a = 4.1328(3) Å

2.386(71), 2.066(100), 1.461(61), 1.246(29), 1.193(19), 0.948(10), 0.924(21), 0.844(14)

Type material is deposited in the meteorite collections of the Central Siberian Geological Museum of V.S. Sobolev Institute of Geology and Mineralogy, Siberian Branch of the Russian Academy of Sciences, Novosibirsk, Russia, registration number 52 – meteorite Uakit, and the Museum of the Buryatian Scientific Centre, Siberian Branch of the Russian Academy of Sciences, Ulan-Ude, Russia, registration number Uakit-MBSC435/G84

How to cite: Sharygin, V.V., Ripp, G.S., Yakovlev, G.A., Seryotkin, Y.V., Karmanov, N.S., Izbrodin, I.A., Grokhovsky, V.I. and Khromova, E.A. (2018) Uakitite, IMA 2018-003. CNMNC Newsletter No. 43, June 2018, page 649; European Journal of Mineralogy, 30, 647–652.

IMA No. 2018-004

Ferrorockbridgeite

(Fe²⁺,Mn²⁺)₂(Fe³⁺)₃(PO₄)₃(OH)₄(H₂O)

Hagendorf-Süd pegmatite mine, 76 metre level, Hagendorf, Oberpfalz, Bavaria, Germany (49°39′1″N, 12°27′35″E)

Ian E. Grey*, Anthony R. Kampf, Erich Keck, Colin M. MacRae, John Cashion and Yesim Gozukara

*E-mail: [email protected]

Rockbridgeite group

Orthorhombic: Bbmm; structure determined

a = 13.994(1), b = 16.884(1), c = 5.1866(4) Å

6.987(21), 4.853(26), 3.615(24), 3.465(33), 3.424(39), 3.205(100), 2.774(22), 1.603(24)

Type material is deposited in the mineralogical collections of the Museum Victoria, 11 Nicholson St, Carlton, VIC 3053, Australia, registration number M54126 (holotype), and the Natural History Museum of Los Angeles County, 900 Exposition Blvd, Los Angeles, California, USA, catalogue number 67281 (cotype)

How to cite: Grey, I.E., Kampf, A.R., Keck, E., MacRae, C.M., Cashion, J. and Gozukara, Y. (2018) Ferrorockbridgeite, IMA 2018-004. CNMNC Newsletter No. 43, June 2018, page 649; European Journal of Mineralogy, 30, 647–652.

IMA No. 2018-005

Belogubite

CuZn(SO₄)₂·10H₂O

Gayskoe Zn-Cu deposit, Orenburgskaya Oblast’, South Urals, Russia (51°28′00″N, 58°29′39″E)

Anatoly V. Kasatkin*, Sergey N. Britvin, Radek Škoda, Atali A. Agakhanov, Dmitriy I. Belakovskiy and Nikita V. Chukanov

*E-mail: [email protected]

Chalcanthite group

Triclinic: $P1¯$⁠; structure determined

a = 6.2548(1), b = 10.6112(2), c = 6.0439(1) Å, α = 82.587(1), β = 109.625(1), γ = 104.848(1)°

5.73(35), 5.576(47), 4.873(100), 3.907(31), 3.719(45), 3.229(27), 2.915(25), 2.684(26)

Type material is deposited in the collections of the Fersman Mineralogical Museum, Russian Academy of Sciences, Leninsky Prospekt 18-2, 119071 Moscow, Russia, registration number 5130/1

How to cite: Kasatkin, A.V., Britvin, S.N., Škoda, R., Agakhanov, A.A., Belakovskiy, D.I. and Chukanov, N.V. (2018) Belogubite, IMA 2018-005. CNMNC Newsletter No. 43, June 2018, page 649; European Journal of Mineralogy, 30, 647–652.

IMA No. 2018-007

Dalnegorskite

Ca₅Mn(Si₃O₉)₂

Dalnegorskoe boron deposit, Dalnegorsk, Primorskiy Kray, Russian Far East, Russia

Nadezhda V. Shchipalkina*, Igor V. Pekov, Dmitry A. Ksenofontov, Nikita V. Chukanov, Dmitry I. Belakovskiy and Natalya N. Koshlyakova

*E-mail: [email protected]

Closely related to bustamite

Triclinic: $P1¯$⁠; structure determined

a = 7.259(1), b = 7.857(1), c = 7.8765(6) Å, α = 88.55(1), β = 62.58(1), γ = 76.621(6)°

3.284(41), 2.952(100), 2.951(70), 2.280(45), 1.815(92), 1.740(39), 1.708(34), 1.465(39)

Type material is deposited in the collections of the Fersman Mineralogical Museum, Russian Academy of Sciences, Leninsky Prospekt 18-2, 119071 Moscow, Russia, registration number 5184/1

How to cite: Shchipalkina, N.V., Pekov, I.V., Ksenofontov, D.A., Chukanov, N.V., Belakovskiy, D.I. and Koshlyakova, N.N. (2018) Dalnegorskite, IMA 2018-007. CNMNC Newsletter No. 43, June 2018, page 650; European Journal of Mineralogy, 30, 647–652.

IMA No. 2018-008

Zubkovaite

Ca₃Cu₃(AsO₄)₄

Arsenatnaya fumarole, Second scoria cone of the Northern Breakthrough of the Great Tolbachik Fissure Eruption, Tolbachik volcano, Kamchatka peninsula, Far-Eastern Region, Russia (55°41′N, 160°14′E, 1200 m asl)

Igor V. Pekov*, Inna S. Lykova, Atali A. Agakhanov, Dmitry I. Belakovskiy, Marina F. Vigasina, Sergey N. Britvin, Anna G. Turchkova, Evgeny G. Sidorov and Katharina S. Scheidl

*E-mail: [email protected]

New structure type

Monoclinic: C2; structure determined

a = 16.836(3), b = 5.0405(8), c = 9.117(2) Å, β = 117.39(1)°

7.44(100), 3.727(79), 3.334(92), 2.914(73), 2.789(48), 2.765(50), 2.591(96), 2.521(53)

Type material is deposited in the collections of the Fersman Mineralogical Museum, Russian Academy of Sciences, Leninsky Prospekt 18-2, 119071 Moscow, Russia, registration number 5185/1

How to cite: Pekov, I.V., Lykova, I.S., Agakhanov, A.A., Belakovskiy, D.I., Vigasina, M.F., Britvin, S.N., Turchkova, A.G., Sidorov, E.G. and Scheidl, K.S. (2018) Zubkovaite, IMA 2018-008. CNMNC Newsletter No. 43, June 2018, page 650; European Journal of Mineralogy, 30, 647–652.

IMA No. 2018-009

Phoxite

(NH₄)₂Mg₂(C₂O₄)(PO₃OH)₂(H₂O)₄

Rowley mine, 125-foot level, Theba, Painted Rock district, Maricopa Co., Arizona, USA (33°2′57″N, 113°1′49.59″W)

Anthony R. Kampf*, Aaron J. Celestian, Barbara P. Nash and Joe Marty

*E-mail: [email protected]

New structure type

Monoclinic: P2₁/c; structure determined

a = 7.2962(3), b = 13.5993(4), c = 7.8334(6) Å, β = 108.271(8)°

6.17(100), 5.57(85), 3.799(60), 3.377(59), 2.914(72), 3.536(32), 2.425(37), 2.275(63)

Cotype material is deposited in the mineralogical collections of the Natural History Museum of Los Angeles County, 900 Exposition Blvd, Los Angeles, California, USA, catalogue numbers 66697, 66698, 66699 and 66700

How to cite: Kampf, A.R., Celestian, A.J., Nash, B.P. and Marty, J. (2018) Phoxite, IMA 2018-009. CNMNC Newsletter No. 43, June 2018, page 650; European Journal of Mineralogy, 30, 647–652.

IMA No. 2018-011

Achyrophanite

(K,Na)₃(Fe³⁺,Ti,Al,Mg)₅O₂(AsO₄)₅

Arsenatnaya fumarole, Second scoria cone of the Northern Breakthrough of the Great Tolbachik Fissure Eruption, Tolbachik volcano, Kamchatka peninsula, Far-Eastern Region, Russia (55°41′N, 160°14′E, 1200 m asl)

Igor V. Pekov*, Natalia V. Zubkova, Natalia N. Koshlyakova, Dmitry I. Belakovskiy, Marina F. Vigasina, Atali A. Agakhanov, Sergey N. Britvin, Anna G. Turchkova, Evgeny G. Sidorov and Dmitry Y. Pushcharovsky

*E-mail: [email protected]

New structure type

Orthorhombic: P222₁; structure determined

a = 6.5824(2), b = 13.2488(4), c = 10.7613(3) Å

5.615(59), 4.174(42), 3.669(31), 3.148(33), 2.852(43), 2.814(100), 2.689(29), 2.237(28)

Type material is deposited in the collections of the Fersman Mineralogical Museum of the Russian Academy of Sciences, Moscow, Russia, registration number 5029/1

How to cite: Pekov, I.V., Zubkova, N.V., Koshlyakova, N.N., Belakovskiy, D.I., Vigasina, M.F., Agakhanov, A.A., Britvin, S.N., Turchkova, A.G., Sidorov, E.G. and Pushcharovsky, D.Y. (2018) Achyrophanite, IMA 2018-011. CNMNC Newsletter No. 43, June 2018, page 650; European Journal of Mineralogy, 30, 647–652.

IMA No. 2018-012

Dokuchaevite

Cu₈O₂(VO₄)₃Cl₃

Yadovitaya (“Poisonous”) fumarole, Second scoria cone of the Northern Breakthrough of the Great Tolbachik Fissure Eruption, Tolbachik volcano, Kamchatka peninsula, Far-Eastern Region, Russia (55°50′N, 160°20′E)

Oleg I. Siidra*, Evgeny V. Nazarchuk, Anatoly N. Zaitsev, Yury S. Polekhovsky, Thomas Wenzel and John Spratt

*E-mail: [email protected]

Chemically and structurally related to yaroshevite

Triclinic: $P1¯$⁠; structure determined

a = 6.332(3), b = 8.204(4), c = 15.562(8) Å, α = 90.498(8), β = 97.173(7), γ = 90.896(13)°

15.440(18), 7.276(27), 5.596(43), 4.857(33), 3.193(29), 2.791(30), 2.564(21), 2.522(100)

Type material is deposited in the collections of the Mineralogical Museum, Department of Mineralogy, St Petersburg State University, St Petersburg, Russia, specimen number 1/19664

How to cite: Siidra, O.I., Nazarchuk, E.V., Zaitsev, A.N., Polekhovsky, Y.S., Wenzel, T. and Spratt, J. (2018) Dokuchaevite, IMA 2018-012. CNMNC Newsletter No. 43, June 2018, page 651; European Journal of Mineralogy, 30, 647–652.

IMA No. 2018-013

Koryakite

NaKMg₂Al₂(SO₄)₆

Yadovitaya (“Poisonous”) fumarole, Second scoria cone of the Northern Breakthrough of the Great Tolbachik Fissure Eruption, Tolbachik volcano, Kamchatka peninsula, Far-Eastern Region, Russia (55°50′N, 160°20′E)

Evgeny V. Nazarchuk, Oleg I. Siidra*, Anatoly N. Zaitsev and Natalia S. Vlasenko

*E-mail: [email protected]

Structurally related to millosevichite and mikasaite

Trigonal: $R3¯$⁠; structure determined

a = 8.1124(11), c = 22.704(7) Å

5.936(10), 3.585(55), 2.763(100), 2.633(7), 2.340(22), 2.158(12), 1.991(9), 1.789(30)

Type material is deposited in the collections of the Mineralogical Museum, Department of Mineralogy, St Petersburg State University, St Petersburg, Russia, specimen number 1/19688

How to cite: Nazarchuk, E.V., Siidra, O.I., Zaitsev, A.N. and Vlasenko, N.S. (2018) Koryakite, IMA 2018-013. CNMNC Newsletter No. 43, June 2018, page 651; European Journal of Mineralogy, 30, 647–652.

IMA No. 2018-014

Aleutite

[Cu₅O₂](AsO₄)(VO₄)·(Cu,K,Pb,Rb,Cs,)Cl

Yadovitaya (“Poisonous”) fumarole, Second scoria cone of the Northern Breakthrough of the Great Tolbachik Fissure Eruption, Tolbachik volcano, Kamchatka peninsula, Far-Eastern Region, Russia (55°50′N, 160°20′E)

Oleg I. Siidra*, Evgeny V. Nazarchuk, Atali A. Agakhanov and Yury S. Polekhovsky

*E-mail: [email protected]

New structure type

Monoclinic: C2/m; structure determined

a = 18.090(2), b = 6.2284(6), c = 8.2465(9) Å, β = 90.597(2)°

4.796(46), 3.396(29), 2.985(48), 2.934(74), 2.913(31), 2.825(36), 2.567(30), 2.449(100)

Type material is deposited in the collections of the Mineralogical Museum, Department of Mineralogy, St Petersburg State University, St Petersburg, Russia, specimen number 1/19689

How to cite: Siidra, O.I., Nazarchuk, E.V., Agakhanov, A.A. and Polekhovsky, Y.S. (2018) Aleutite, IMA 2018-014. CNMNC Newsletter No. 43, June 2018, page 651; European Journal of Mineralogy, 30, 647–652.

IMA No. 2018-015

Elasmochloite

Na₃Cu₆BiO₄(SO₄)₅

Arsenatnaya fumarole, Second scoria cone of the Northern Breakthrough of the Great Tolbachik Fissure Eruption, Tolbachik volcano, Kamchatka peninsula, Far-Eastern Region, Russia (55°41′N, 160°14′E, 1200 m asl)

Igor V. Pekov*, Sergey N. Britvin, Atali A. Agakhanov, Marina F. Vigasina and Evgeny G. Sidorov

*E-mail: [email protected]

New structure type

Monoclinic: P2₁/n; structure determined

a = 10.1273(9), b = 10.1193(8), c = 21.112(2) Å, β = 102.272(8)°

10.33(100), 7.04(18), 6.33(14), 3.576(24), 3.397(13), 2.920(14), 2.529(14), 2.460(14)

Type material is deposited in the collections of the Fersman Mineralogical Museum, Russian Academy of Sciences, Moscow, Russia, registration number 5189/1

How to cite: Pekov, I.V., Britvin, S.N., Agakhanov, A.A., Vigasina, M.F. and Sidorov, E.G. (2018) Elasmochloite, IMA 2018-015. CNMNC Newsletter No. 43, June 2018, page 651; European Journal of Mineralogy, 30, 647–652.

IMA No. 2018-016

Majzlanite

K₂Na(ZnNa)Ca(SO₄)₄

Yadovitaya (“Poisonous”) fumarole, Second scoria cone of the Northern Breakthrough of the Great Tolbachik Fissure Eruption, Tolbachik volcano, Kamchatka peninsula, Far-Eastern Region, Russia (55°50′N, 160°20′E)

Oleg I. Siidra*, Evgeny V. Nazarchuk, Anatoly N. Zaitsev and Vladimir V. Shilovskikh

*E-mail: [email protected]

New structure type

Monoclinic: C2/c; structure determined

a = 16.007(2), b = 9.524(1), c = 9.118(1) Å, β = 94.828(7)°

3.372(40), 3.147(56), 3.106(65), 2.949(50), 2.874(100), 2.835(70), 2.803(45), 2.616(41)

Type material is deposited in the collections of the Mineralogical Museum, Department of Mineralogy, St Petersburg State University, St Petersburg, Russia, specimen number 1/19690

How to cite: Siidra, O.I., Nazarchuk, E.V., Zaitsev, A.N. and Shilovskikh, V.V. (2018) Majzlanite, IMA 2018-016. CNMNC Newsletter No. 43, June 2018, page 652; European Journal of Mineralogy, 30, 647–652.

IMA No. 2018-017

Jahnsite-(NaMnMg)

$(Na,Ca)(Mn2+,Fe3+)(Mg,Fe3+)22Fe23+(PO4)4(OH)2(H2O)8$

Sapucaia pegmatite, Conselheiro Pena district, Minas Gerais, Brazil (18°54′38″S, 41°29′61″W)

Anthony R. Kampf*, Barbara P. Nash, Luigi Chiappino and Sergio Varvello

*E-mail: [email protected]

Jahnsite group

Monoclinic: P2/a; structure determined

a = 15.104(1), b = 7.1629(2), c = 9.8949(7) Å, β = 110.640(7)°

9.29(100), 5.02(27), 4.91(30), 3.546(32), 2.975(26), 2.834(91), 2.601(33), 1.944(33)

Type material is deposited in the collections of the Mineral Sciences Department, Natural History Museum of Los Angeles County, 900 Exposition Boulevard, Los Angeles, California 90007, USA, catalogue number 66701

How to cite: Kampf, A.R., Nash, B.P., Chiappino, L. and Varvello, S. (2018) Jahnsite-(NaMnMg), IMA 2018-017. CNMNC Newsletter No. 43, June 2018, page 652; European Journal of Mineralogy, 30, 647–652.

The jahnsite group is established. Minerals within the jahnsite group conform to the general formula XM1M2₂M3₂(H₂O)₈(OH)₂(PO₄)₄. The jahnsite group is divided into the jahnsite subgroup (M3 = Fe³⁺), which currently includes ten mineral species, and the whiteite subgroup (M3 = Al), which currently includes seven mineral species.

The welinite group is established. Minerals within the welinite group conform to the general formula $M262+M1aM1bx+(SiO4)2O(x-2)(OH)(8-x)$⁠, where x is the total charge pfu at the M1 sites. The welinite group currently includes four mineral species, all of them having M2 = Mn²⁺: welinite (M1 = W⁶⁺□), franciscanite (M1 = V⁵⁺□), örebroite (M1 = Sb⁵⁺Fe³⁺), and barwoodite (M1 = Nb⁵⁺□).

Currently the IMA List of Minerals includes as valid species the following three minerals, all with G (= grandfathered) status: calcioursilite, Ca₄(UO₂)₄(Si₂O₅)₅(OH)₆·15H₂O; magnioursilite, Mg₄(UO₂)₄(Si₂O₅)₅(OH)₆·20H₂O; ursilite, Mg₄(UO₂)₄(Si₂O₅)_5.5(OH)₅·13H₂O. Historically, calcioursilite and magnioursilite were described together in 1957 as “ursilite” from the Oktyabr’skoye deposit, Kyzyltyube-Saj, Samgar Steppe, Tajikistan [Voprosy Geologii Urana (Problems of the Uranium Geology), Moscow, 73 (1957)]. At that occurrence, analyses with Ca > Mg and Mg > Ca were recorded. Subsequently, calcioursilite and magnioursilite were defined instead of ursilite [Proc. 2nd U.N. Int. Conf. on the Peaceful Uses of Atomic Energy, 2, 298–299 (1958); ibidem, 3, 174–177 (1959)]. Therefore today the name “ursilitev” is nothing but an obsolete redundancy, and should be officially discredited. This is an executive decision taken by the officers of the IMA CNMNC.

Proposal 18-B is accepted, and “marshallsussmanite” (IMA No. 2013-067) is renamed schizolite, according to historical priority.