IMA 2018-138 LingbaoiteAgTe
3S60 gold-bearing quartz vein, ca. 30 km SW of Lingbao city, Henan province, China (34°24’N, 110°31’E)
Wei Jian, Jingwen Mao, Bernd Lehmann, Yanhe Li, Huishou Ye, Jianhui Cai and Zongyan Li
Synthetische Nachbildung bekannt; Struktur ermittelt
Trigonal
R3m
a = 8.645(14), c = 5.272(9) Å
3.052(100), 2.161(36), 2.155(50), 1.763(16), 1.757(10), 1.526(9), 1.366(11), 1.363(16)
Type material is deposited in the mineralogical collections of the Institute of Mineral Resources, Chinese Academy of Geological Sciences, Baiwanzhuang Street 26, Beijing, China, catalogue number M13812 (holotype) and the Geological Museum of China, Yangrouhutong Street 15, Xicheng District, Beijing, China, catalogue number M13812 (cotype)
Jian W., Mao J., Lehmann B., Li Y., Ye H., Cai J. and Li Z. (2019) Lingbaoite, IMA 2018-138. CNMNC Newsletter No. 50; Mineralogical Magazine, 31, doi: 10.1180/mgm.2019.46
IMA 2019-007 GmalimiteK
6☐Fe
2+24S
27Halamish wadi, southern part of the Hatrurim Complex, Negev Desert, Israel (31°09’42”N, 35°17’29”E)
Irina O. Galuskina, Biljana Krüger, Evgeny V. Galuskin, Hannes Krüger, Yevgeny Vapnik, Kamila Banasik, Mikhail Murashko, Atali A. Agakhanov and Anuschka Pauluhn
Das K Analog von zoharite; Struktur ermittelt
Kubisch
Pm-3m
a = 10.34863(8) Å
10.357(91), 7.323(33), 5.979(59), 3.123(56), 2.990(58), 2.376(50), 1.831(100), 1.057(14)
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 5297/1
Galuskina I.O., Krüger B., Galuskin E.V., Krüger H., Vapnik Y., Banasik K., Murashko M., Agakhanov A.A. and Pauluhn A. (2019) Gmalimite, IMA 2019-007. CNMNC Newsletter No. 50; Mineralogical Magazine, 31, doi: 10.1180/mgm.2019.46
IMA 2019-008 Ferroefremovite(NH
4)
2Fe
2+2(SO
4)
3“Bocca Grande” fumarole, Solfatara di Pozzuoli, Flegrean Volcanic Complex, Napoli Province, Campania, Italy (40°49’41”N, 14°8’30”E)
Anatoly V. Kasatkin, Jakub Plášil, Radek Škoda, Italo Campostrini, Nikita V. Chukanov, Atali A. Agakhanov, Vladimir Y. Karpenko and Dmitriy I. Belakovskiy
Das Fe Analog von efremovite; Struktur ermittelt
Kubisch
P213
a = 10.0484(9) Å
5.80(40), 4.50(20), 4.11(30), 3.17(100), 3.02(20), 2.68(50), 1.86(18), 1.62(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 5368/1
Kasatkin A.V., Plášil J., Škoda R., Campostrini I., Chukanov N.V., Agakhanov A.A., Karpenko V.Y. and Belakovskiy D.I. (2019) Ferroefremovite, IMA 2019-008. CNMNC Newsletter No. 50; Mineralogical Magazine, 31, doi: 10.1180/mgm.2019.46
IMA 2019-010 ScordariiteK
8(Fe
3+0.67☐
0.33)[Fe
3+3O(SO
4)
6]
2·14H
2O
Monte Arsiccio mine, Stazzema (LU), Apuan Alps, Tuscany, Italy (43°58’N, 10°17’E)
Cristian Biagioni, Luca Bindi and Daniela Mauro
Strukturell verwandt mit metavoltine und carlsonite; Struktur ermittelt
Trigonal
R-3
a = 9.7509(4), c = 53.525(2) Å
8.8 (mw), 8.3(s), 6.6(m), 4.22(m), 3.777(m), 3.299(m), 3.189(m), 2.884(s)
Type material is deposited in the mineralogical collections of the Museo di Storia Naturale, Università di Pisa, Via Roma 79, Calci (Pisa, Italy), catalogue number 19893
Biagioni C., Bindi L. and Mauro D. (2019) Scordariite, IMA 2019-010. CNMNC Newsletter No. 50; Mineralogical Magazine, 31, doi: 10.1180/mgm.2019.46
IMA 2019-011 LimousiniteBaCa[Be
4P
4O
16]∙6H
2O
Vilatte-Haute quarry, Chanteloube near Razès, Limousin, Haute-Vienne, France (46°03’55”N, 1°22’03”E)
Frédéric Hatert, Nicolas Meisser, Fabrice Dal Bo, Yannick Bruni, Pietro Vignola, Andrea Risplendente, François-Xavier Châtenet and Julien Lebocey
Strukturell verwandt mit phillipsite; Struktur ermittelt
Monoklin
P21/c
a = 9.4958(4), b = 13.6758(4), c = 13.4696(4) Å, β = 90.398(3)°
3.89(100), 3.75(60), 3.09(60), 3.01(90), 2.219(50), 2.058(60), 1.879(40), 1.735(40)
Type material is deposited in the mineralogical collections of the Geological Museum of Lausanne, Switzerland, catalogue number MGL 093398, and the Laboratory of Mineralogy, University of Liège, Belgium, catalogue number ULG 21167
Hatert F., Meisser N., Dal Bo F., Bruni Y., Vignola P., Risplendente A., Châtenet F.- X. and Lebocey J. (2019) Limousinite, IMA 2019-011. CNMNC Newsletter No. 50; Mineralogical Magazine, 31, doi: 10.1180/mgm.2019.46
IMA 2019-012 NishanbaeviteKAl
2O(AsO
4)(SO
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, Natalia V. Zubkova, Vasiliy O. Yapaskurt, Dmitry I. Belakovskiy, Sergey N. Britvin, Atali A. Agakhanov, Anna G. Turchkova, Evgeny G. Sidorov and Dmitry Y. Pushcharovsky
Neuer Strukturtyp; Struktur ermittelt
Orthorhombisch
Pbcm
a = 15.487(3), b = 7.258(2), c = 6.601(2) Å
15.49(100), 6.56(30), 4.653(29), 3.881(54), 3.625(27), 3.289(52), 3.113(29), 3.038(51)
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 5379/1
Pekov I.V., Zubkova N.V., Yapaskurt V.O., Belakovskiy D.I., Britvin S.N., Agakhanov A.A., Turchkova A.G., Sidorov E.G. and Pushcharovsky D.Y. (2019) Nishanbaevite, IMA 2019-012. CNMNC Newsletter No. 50; Mineralogical Magazine, 31, doi: 10.1180/mgm.2019.46
IMA 2019-013 NazaroviteNi
12P
5Halamish wadi, southern part of the Hatrurim basin, Negev Desert, Israel (31°9’47”N, 35°17’57”E – holotype); Marjalahti meteorite, fallen June 01, 1902 at the northern coast of the Ladoga see, Karelia, Russia (61°30’N, 30°30’E – cotype)
Sergey N. Britvin, Mikhail N. Murashko, Maria G. Krzhizhanovskaya, Oleg S. Vereshchagin, Yevgeny Vapnik, Vladimir V. Shilovskikh and Maksim S. Lozhkin
Synthetische Nachbildung bekannt; Struktur ermittelt
Tetragonal
I4/m
a = 8.640(1), c = 5.071(3) Å
4.374(5), 2.503(5), 2.341(54), 2.160(13), 2.040(15), 1.931(40), 1.860(100)
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 5381/1
Britvin S.N., Murashko M.N., Krzhizhanovskaya M.G., Vereshchagin O.S., Vapnik Y., Shilovskikh V.V. and Lozhkin M.S. (2019) Nazarovite, IMA 2019-013. CNMNC Newsletter No. 50; Mineralogical Magazine, 31, doi: 10.1180/mgm.2019.46
IMA 2019-014 SangenaroiteAg
8(Sb
8–xAsx)S
16 (0 < x < 2)
San Genaro mine, Huancavelica, Peru (13°11’30.4”S, 75°8’36.3”W)
Dan Topa, Frank N. Keutsch and Chris Stanley
Das Sb-reiche Endglied von ferdowsiite; Struktur ermittelt
Monoklin
P21/n
a = 8.758(2), b = 5.814(1), c = 13.876(3) Å, β = 96.666(3)°
3.23(97), 3.23(94), 2.907(78), 2.773(100), 2.720(90), 2.007(62), 1.986(56), 1.944(36)
Type material is deposited in the mineralogical collections of the Naturhistorisches Museum, Burgring 7, 1010 Wien, Austria, specimen number O 1090
Topa D., Keutsch F.N. and Stanley C. (2019) Sangenaroite, IMA 2019-014. CNMNC Newsletter No. 50; Mineralogical Magazine, 31, doi: 10.1180/mgm.2019.46
IMA 2019-018 PatyniteNaKCa
4[Si
9O
23]
Patyn Mt. massif, Tashtagolskiy District, Kemerovo Oblast’, Southern Siberia, Russia (53°3’32”N, 88°44’29”E)
Anatoly V. Kasatkin, Fabrizio Nestola, Nikita V. Chukanov, Radek Škoda, Fernando Cámara, Atali A. Agakhanov, Dmitriy I. Belakovskiy and Vladimir S. Lednyov
Neuer Strukturtyp; Struktur ermittelt
Triklin
P-1
a = 7.2743(1), b = 10.5516(2), c = 13.9851(3) Å, α = 104.203(2), β = 104.302(2), γ = 92.028(1)°
4.947(13), 3.454(100), 3.262(66), 3.103(64), 2.931(16), 2.801(21), 2.592(18), 1.820(28)
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 5369/1
Kasatkin A.V., Nestola F., Chukanov N.V., Škoda R., Cámara F., Agakhanov A.A., Belakovskiy D.I. and Lednyov V.S. (2019) Patynite, IMA 2019-018. CNMNC Newsletter No. 50; Mineralogical Magazine, 31, doi: 10.1180/mgm.2019.46
IMA 2018-123a Taipingite-(Ce)(Ce
3+7Ca
2)
Σ9Mg(SiO
4)
3[SiO
3(OH)]
4F
3Taiping town deposit, North Qinling Orogen, southeast Henan Province, China (33°39’10”N, 111°41’33”E)
Kai Qu, Xianzhang Sima, Guang Fan, Guowu Li, Ganfu Shen, Huakai Chen, Xing Liu, Qingqing Yin, Ting Li and Yanjuan Wang
Cerite-Gruppe; Struktur ermittelt
Trigonal
R3c
a = 10.7246(3), c = 37.953(1) Å
4.518(50), 3.455(95), 3.297(85), 3.098(35), 2.941(100), 2.683(65), 1.945(40), 1.754(40)
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 M16084
Qu K., Sima X., Fan G., Li G., Shen G., Chen H., Liu X., Yin Q., Li T. and Wang Y. (2019) Taipingite-(Ce), IMA 2018-123a. CNMNC Newsletter No. 50; Mineralogical Magazine, 31, doi: 10.1180/mgm.2019.46
IMA 2019-017 DritsiteLi
2Al
4(OH)
12Cl
2·3(H
2O)
Drillcore of borehole #2001 (depth 248 m), Romanovskiy area of the Verkhnekamskoe potassium salt deposit, 30 km S of the city of Berezniki, Perm Krai, Western Urals, Russia
Elena S. Zhitova, Igor V. Pekov, Ilya I. Chaikovskiy, Elena P. Chirkova, Vasiliy O. Yapaskurt, Yana V. Bychkova, Dmitry I. Belakovsky, Nikita V. Chukanov, Natalia V. Zubkova, Sergey V. Krivovichev and Vladimir N. Bocharov
Hydrotalcite-Supergruppe; Struktur ermittelt
Hexagonal
P63/mcm
a = 5.0960(3), c = 15.358(1) Å
7.68(100), 4.422(61), 3.832(99), 2.561(30), 2.283(25), 1.963(19), 1.807(20), 1.445(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 5380/1
Zhitova E.S., Pekov I.V., Chaikovskiy I.I., Chirkova E.P., Yapaskurt V.O., Bychkova Y.V., Belakovsky D.I., Chukanov N.V., Zubkova N.V., Krivovichev S.V. and Bocharov V.N. (2019) Dritsite, IMA 2019-017. CNMNC Newsletter No. 50; Mineralogical Magazine, 31, doi: 10.1180/mgm.2019.46
IMA 2019-019 HiroseiteFeSiO
3Suizhou meteorite, fallen in Dayanpo, 12.5 km SE of the Suizhou city, Hubei province, China
Luca Bindi and Xiande Xie
Das Fe Analog von bridgmanite; Struktur ermittelt
Orthorhombisch
Pnma
a = 5.0016(5), b = 7.0031(3), c = 4.8460(3) Å
2.591(16), 2.468(56), 2.423(18), 1.751(68), 1.740(100), 1.434(26), 1.407(33), 1.231(27)
Type material is deposited in the mineralogical collections of the Museo di Storia Naturale, Università di Firenze, Via La Pira 4, I-50121, Firenze, Italy, catalogue number 3238/I
Bindi L. and Xie X. (2019) Hiroseite, IMA 2019-019. CNMNC Newsletter No. 50; Mineralogical Magazine, 31, doi: 10.1180/mgm.2019.46
IMA 2019-020 MonchetundraitePd
2NiTe
2Borehole 1819 (depth 101 m), Monchetundra layered Intrusion, Kola Peninsula, Russia (67°52’22”N, 32°47’60”E)
Anna Vymazalová, František Laufek, Tatiana L. Grokhovskaya and Chris J. Stanley
Synthetische Nachbildung bekannt
Orthorhombisch
Ibam
a = 6.31, b = 11.25, c = 5.17 Å
X-ray powder diffraction not available
Type material is deposited in the mineralogical collections of the Department of Earth Sciences, Natural History Museum, London SW7 5BD, UK, catalogue number BM2019,2
Vymazalová A., Laufek F., Grokhovskaya T.L. and Stanley C.J. (2019) Monchetundraite, IMA 2019-020. CNMNC Newsletter No. 50; Mineralogical Magazine, 31, doi: 10.1180/mgm.2019.46
IMA 2019-021 MaletoyvayamiteAu
3Se
4Te
6Gaching occurrence, Maletoyvayam ore field, southwestern part of the Koryak Highland, central Kamchatka volcanic belt, Far East Region, Russia (60°19’51.87”N, 164°46’25.65”E)
Nadhezda D. Tolstykh, Marek Tuhý, Anna Vymazalová, Jakub Plášil, František Laufek, Anatoly V. Kasatkin and Fabrizio Nestola
Synthetische Nachbildung bekannt
Triklin
P-1
a = 8.901(2), b = 9.045(1), c = 9.265(4) Å, α = 97.66(3), β = 106.70(2), γ = 101.40(1)°
8.650(25), 4.331(5), 2.911(100), 2.223(7), 2.180(6), 1.930(8), 1.901(8), 1.725(6)
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 5369/1
Tolstykh N.D., Tuhý M., Vymazalová A., Plášil J., Laufek F., Kasatkin A.V. and Nestola F. (2019) Maletoyvayamite, IMA 2019-021. CNMNC Newsletter No. 50; Mineralogical Magazine, 31, doi: 10.1180/mgm.2019.46
IMA 2019-022 BianchiniiteBa
2(TiV)(As
2O
5)
2OF
Sant’Olga tunnel, Monte Arsiccio mine, Stazzema (LU), Apuan Alps, Tuscany, Italy (43°58’N, 10°17’E)
Cristian Biagioni, Marco Pasero, Ulf Hålenius and Ferdinando Bosi
Neuer Strukturtyp; Struktur ermittelt
Tetragonal
I4/mcm
a = 8.7301(3), c = 15.6653(5) Å
3.826(w), 3.144(vs), 2.916(w), 2.789(w), 2.598(w), 2.119(w), 2.072(w), 1.975(w)
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 19892
Biagioni C., Pasero M., Hålenius U. and Bosi F. (2019) Bianchiniite, IMA 2019-022. CNMNC Newsletter No. 50; Mineralogical Magazine, 31, doi: 10.1180/mgm.2019.46
IMA 2019-023 Halilsarpite[Mg(H
2O)
6][CaAs
3+2(Fe
3+2.67Mo
6+0.33)(AsO
4)
2O
7]
Oumlil mine, Bou Azzer district, Morocco (30°31’22”N, 6°47’6”W)
Ian E. Grey, Tomas Husdal, Henrik Friis, Fabrice Dal Bo, Anthony R. Kampf, Colin M. MacRae, W. Gus Mumme, Ole-Thorstein Ljøstad and Finlay Shanks
Isostrukturell mit natrowalentaite; Struktur ermittelt
Orthorhombisch
Imma
a = 26.489(1), b = 7.4205(3), c = 10.4378(4) Å
13.28(100), 9.710(16), 6.737(20), 6.042(18), 4.462(33), 3.018(36), 2.944(11), 2.799(14)
Type material is deposited in the mineralogical collections of the Natural History Museum, University of Oslo, PO 1172, Blindern, 0318 Oslo, Norway, registration number 44110 (holotype), and the Natural History Museum of Los Angeles County, 900 Exposition Boulevard, Los Angeles, CA 90007, USA, catalogue number 73567 (cotype)
Grey I.E., Husdal T., Friis H., Dal Bo F., Kampf A.R., MacRae C.M., Mumme W.G., Ljøstad O.-T. and Shanks F. (2019) Halilsarpite, IMA 2019-023. CNMNC Newsletter No. 50; Mineralogical Magazine, 31, doi: 10.1180/mgm.2019.46
IMA 2019-024 MinakawaiteRhSb
Haraigawa, Misato machi, Kumamoto Prefecture, Kyushu Province, Japan
Daisuke Nishio-Hamane and Takahiro Tanaka
Das Sb Analog von cherepanovite
Orthorhombisch
Pnma
a = 5.934(7), b = 3.848(3), c = 6.305(4) Å
2.860(63), 2.774(35), 2.250(47), 2.199(100), 2.162(38), 1.923(49), 1.843(51), 1.584(28)
Type material is deposited in the mineralogical collections of the National Museum of Nature and Science, Tsukuba, Japan, specimen number NSM-46296 (holotype) and NSM-46297 (cotype)
Nishio-Hamane D. and Tanaka T. (2019) Minakawaite, IMA 2019-024. CNMNC Newsletter No. 50; Mineralogical Magazine, 31, doi: 10.1180/mgm.2019.46
IMA 2019-025 Magnesio-lucchesiiteCaMg
3Al
6(Si
6O
18)(BO
3)
3(OH)
3O
Within a lamprophyre dyke, near the O’Grady batholith, Northwest Territories, Canada (62°46’8.33”N, 128°56’9.07”W)
Emily D. Scribner, Jan Cempírek, Lee A. Groat and R. James Evans
Tourmaline-Supergruppe; Struktur ermittelt
Trigonal
R3m
a = 15.9910(3), c = 7.2224(2) Å
6.404(32), 4.238(54), 3.998(58), 3.494(46), 2.972(70), 2.586(100), 2.048(46), 1.926(29)
Type material is deposited in the mineralogical collections of the Canadian Museum of Nature, 240 McLeod St, Ottawa, ON K2P 2R1, Canada, reference number CMNMC 87266
Scribner E.D., Cempírek J., Groat L.A. and Evans R.J. (2019) Magnesio-lucchesiite, IMA 2019-025. CNMNC Newsletter No. 50; Mineralogical Magazine, 31, doi: 10.1180/mgm.2019.46
IMA 2019-026 NavrotskyiteK
2Na
10(UO
2)
3(SO
4)
9·2H
2O
Blue Lizard mine, Red Canyon, White Canyon District, San Juan Co., Utah, USA (37°33’26”N, 110°17’48”W)
Travis A. Olds, Anthony R. Kampf, Samuel L. Perry, Xiaofeng Guo, Joe Marty, Timothy P. Rose and Peter C. Burns
Strukturell verwandt mit meisserite und fermiite; Struktur ermittelt
Orthorhombisch
Pbcm
a = 5.446(1), b = 21.328(5), c = 33.439(8) Å
10.70(43), 5.59(27), 5.28(100), 3.845(36), 3.533(29), 3.225(30), 3.050(44), 2.822(29)
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 73574, 73575 and 73576
Olds T.A., Kampf A.R., Perry S.L., Guo X., Marty J., Rose T.P. and Burns P.C. (2019) Navrotskyite, IMA 2019-026. CNMNC Newsletter No. 50; Mineralogical Magazine, 31, doi: 10.1180/mgm.2019.46
IMA 2019-028 Hingganite-(Nd)Nd
2☐Be
2Si
2O
8(OH)
2Zagi Mountain, near Kafoor Dheri, about 4 km S of Warsak and 30 km NW of Peshawar, Khyber Pakhtunkhwa Province, Pakistan (34°9’N, 71°24’E)
Anatoly V. Kasatkin, Fabrizio Nestola, Radek Škoda, Nikita V. Chukanov, Atali A. Agakhanov, Dmitriy I. Belakovskiy, Arianna Lanza and Markéta Holá
Gadolinite-Supergruppe; Struktur ermittelt
Monoklin
P21/c
a = 4.7719(1), b = 7.6422(2), c = 9.9299(2) Å, β = 89.851(2)°
6.105(95), 4.959(56), 4.773(100), 3.462(58), 3.122(68), 3.028(61), 2.864(87), 2.573(89)
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 5370/1
Kasatkin A.V., Nestola F., Škoda R., Chukanov N.V., Agakhanov A.A., Belakovskiy D.I., Lanza A. and Holá M. (2019) Hingganite-(Nd), IMA 2019-028. CNMNC Newsletter No. 50; Mineralogical Magazine, 31, doi: 10.1180/mgm.2019.46
IMA 2019-030 Metauroxite(UO
2)
2(C
2O
4)(OH)
2(H
2O)
2Burro mine, Slick Rock district, San Miguel Co., Colorado, USA (38°2’42”N, 108°53’23”W)
Anthony R. Kampf, Jakub Plášil, Barbara P. Nash and Joe Marty
Synthetische Nachbildung bekannt; Struktur ermittelt
Triklin
P-1
a = 5.5635(3), b = 6.1152(4), c = 7.8283(4) Å, α = 85.572(5), β = 89.340(4), γ = 82.468(5)°
6.06(45), 5.52(33), 4.97(34), 4.52(100), 3.888(80), 3.748(22), 3.180(51), 2.604(32)
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 67289 and 67290
Kampf A.R., Plášil J., Nash B.P. and Marty J. (2019) Metauroxite, IMA 2019-030. CNMNC Newsletter No. 50; Mineralogical Magazine, 31, doi: 10.1180/mgm.2019.46