IMA Commission on New Minerals, Nomenclature and Classification (CNMNC) – Newsletter 65

Miyawaki, Ritsuro; Hatert, Frédéric; Pasero, Marco; Mills, Stuart J.

doi:https://doi.org/10.5194/ejm-34-143-2022

Articles | Volume 34, issue 1

https://doi.org/10.5194/ejm-34-143-2022

© Author(s) 2022. This work is distributed under
the Creative Commons Attribution 4.0 License.

https://doi.org/10.5194/ejm-34-143-2022

© Author(s) 2022. This work is distributed under
the Creative Commons Attribution 4.0 License.

Articles | Volume 34, issue 1

CNMNC Newsletter

|

24 Feb 2022

CNMNC Newsletter |

| 24 Feb 2022

IMA Commission on New Minerals, Nomenclature and Classification (CNMNC) – Newsletter 65

Ritsuro Miyawaki, Frédéric Hatert, Marco Pasero, and Stuart J. Mills

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Received: 03 Feb 2022 – Published: 24 Feb 2022

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 (ideal formula);
mineral symbol;
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 X-ray powder 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 European Journal of Mineralogy on a routine basis, as well as being added month by month to the commission's website. 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.

1 New mineral proposals approved in December 2021

IMA no. 2021-062a

Slyudyankaite
Sdy
Na₂₈Ca₄(Si₂₄Al₂₄O₉₆)(SO₄)₆ $(S_{6})_{1 / 3}$ (CO₂)•2H₂O
Malo-Bystrinskoe deposit, Baikal Lake area, eastern Siberia, Russia (51^∘40^′50^′′ N, 103^∘25^′18^′′ E)
Anatoly N. Sapozhnikov, Nadezhda B. Bolotina, Nikita V. Chukanov*, Ekaterina V. Kaneva, Roman Y. Shendrik, Marina F. Vigasina, and Larisa A. Ivanova
*E-mail: nikchukanov@yandex.ru
Sodalite group
Triclinic: P1; structure determined
a= 9.0523(4), b= 12.8806(6), c= 25.681(1) Å, α= 89.988(2), β= 90.052(1), γ= 90.221(1)^∘
12.93(6), 6.45(20), 3.716(100), 2.878(12), 2.625(23), 2.431(6), 2.143(11), 1.784(9)
Type material is deposited in the collections of the Sidorov Mineralogical Museum (INRTU), Lermontova St. 83, Irkutsk 664074, Russia, registration numbers MMU/MF 27296 (holotype) and MMU/MF 27297 (cotype)
How to cite: Sapozhnikov, A. N., Bolotina, N. B., Chukanov, N. V., Kaneva, E. V., Shendrik, R. Y., Vigasina, M. F., and Ivanova, L. A.: Slyudyankaite, IMA 2021-062a, in: CNMNC Newsletter 65, Eur. J. Mineral., 34, https://doi.org/10.5194/ejm-34-143-2022, 2022.

IMA no. 2021-081

Kozłowskiite
Kzw
Ca₄Fe²⁺Sn₃(Si₂O₇)₂(Si₂O₆OH)₂
In a pegmatite of the Karkonosze granite, Szklarska Poręba Huta quarry, Lower Silesia, Poland (50^∘49^′40^′′ N, 15^∘29^′22^′′ E)
Adam Pieczka*, Sylwia Zelek-Pogudz, Bożena Gołębiowska, Katarzyna M. Stadnicka, and R. James Evans
*E-mail: pieczka@agh.edu.pl
Kristiansenite group
Triclinic (pseudomonoclinic): C1; structure determined
a= 10.0170(3), b= 8.3860(2), c= 13.3421(4) Å, α= 90, β= 109.050(3), γ= 90^∘
5.190(73), 4.569(30), 3.906(19), 3.153(65), 3.094(28), 3.089(100), 2.595(27), 2.141(31)
Type material is deposited in the collections of the Mineralogical Museum, University of Wrocław, Cybulskiego 30, 50–205 Wrocław, Poland, catalogue number MMWr IV7929
How to cite: Pieczka, A., Zelek-Pogudz, S., Gołębiowska, B., Stadnicka, K. M., and Evans, R. J.: Kozłowskiite, IMA 2021-081, in: CNMNC Newsletter 65, Eur. J. Mineral., 34, https://doi.org/10.5194/ejm-34-143-2022, 2022.

IMA no. 2021-082

Medvedevite
Mvv
KMn²⁺V₂O₆Cl•2H₂O
Toludskoe lava field, 2012–2013 Tolbachik Fissure Eruption, Plosky Tolbachik volcano, Kamchatka, Russia (55^∘45^′02^′′ N, 160^∘19^′41^′′ E)
Andrey P. Shablinskii*, Margarita S. Avdontseva, Lidiya P. Vergasova, Stanislav K. Filatov, Evgenia Y. Avdontseva, Alexey V. Povolotskiy, Svetlana V. Moskaleva, Anatoly A. Kargopoltsev, and Sergey N. Britvin
*E-mail: shablinskii.andrey@mail.ru
New structure type
Monoclinic: P2 $_{1} / c$ ; structure determined
a= 7.1863(2), b= 10.1147(3), c= 12.7252(4) Å, β= 106.243(3)^∘
7.79(100), 5.70(11), 4.75(14), 3.89(29), 3.25(53), 3.05(19), 2.958(79), 2.850(33)
Type material is deposited in the collections of the Saint Petersburg State University mineralogical museum, University Emb. 7 $/$ 9, St. Petersburg 199034, Russia, catalogue number 1/19900
How to cite: Shablinskii, A. P., Avdontseva, M. S., Vergasova, L. P., Filatov, S. K., Avdontseva, E. Y., Povolotskiy, A. V., Moskaleva, S. V., Kargopoltsev, A. A., and Britvin, S. N.: Medvedevite, IMA 2021-082, in: CNMNC Newsletter 65, Eur. J. Mineral., 34, https://doi.org/10.5194/ejm-34-143-2022, 2022.

IMA no. 2021-083

Tennantite-(Cd)
Tnt-Cd
Cu₆(Cu₄Cd₂)As₄S₁₃
Berenguela mining district, Pacajes Province, La Paz, Bolivia
Cristian Biagioni*, Anatoly V. Kasatkin, Jiří Sejkora, Fabrizio Nestola, and Radek Škoda
*E-mail: cristian.biagioni@unipi.it
Tetrahedrite group
Cubic: $I \overline{4}$ 3m; structure determined
a= 10.3088(2) Å
4.206(7), 2.973(100), 2.574(12), 2.428(4), 2.019(3), 1.881(5), 1.821(27), 1.553(8)
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 5755/1 (holotype), and the Department of Mineralogy and Petrology, National Museum of Prague, Cirkusová 1740, 19300 Prague 9, Czech Republic, registration number P1P 47/2021 (cotype)
How to cite: Biagioni, C., Kasatkin, A. V., Sejkora, J., Nestola, F., and Škoda, R.: Tennantite-(Cd), IMA 2021-083, in: CNMNC Newsletter 65, Eur. J. Mineral., 34, https://doi.org/10.5194/ejm-34-143-2022, 2022.

IMA no. 2021-084

Höslite
Hös
${Fe}_{3}^{3 +}$ (VO₄)₂(SO₄)(OH)(H₂O)₄•3H₂O
Struhadlo deposit, near the Struhadlo village, 10 km west of Klatovy, Plzeň region, Southern Bohemia, Czech Republic (49^∘23^′51.11^′′ N, 13^∘11^′20.61^′′ E)
Pavel Škácha*, Jiří Sejkora, Gwladys Steciuk, Jakub Plášil, and Radek Škoda
*E-mail: skachap@seznam.cz
Structurally similar to schubnelite
Monoclinic: P2 $_{1} / c$ ; structure determined
a= 8.657(3), b= 10.443(4), c= 20.4996(7) Å, β= 93.32(2)^∘
10.233(100), 6.800(17), 6.422(9), 5.116(10), 3.411(12), 3.233(8), 3.179(13), 3.125(9)
Type material is deposited in the collections of the Department of Mineralogy and Petrology, National Museum in Prague, Cirkusová 1740, 19300 Prague 9, Czech Republic, catalogue number P1P 30/2021
How to cite: Škácha, P., Sejkora, J., Steciuk, G., Plášil, J., and Škoda, R.: Höslite, IMA 2021-084, in: CNMNC Newsletter 65, Eur. J. Mineral., 34, https://doi.org/10.5194/ejm-34-143-2022, 2022.

IMA no. 2021-086

Gurzhiite
Grz
Al(UO₂)(SO₄)₂F•10H₂O
495 m level of the underground Mine 2, Bykogorskoe U deposit, Byk Mountain, Stavropol Krai, Northern Caucasus, Russia (44^∘11^′05.4^′′ N, 42^∘57^′31.5^′′ E)
Anatoly V. Kasatkin*, Jakub Plášil, Nikita V. Chukanov, Radek Škoda, Fabrizio Nestola, Atali A. Agakhanov, and Dmitry I. Belakovskiy
*E-mail: anatoly.kasatkin@gmail.com
A lower hydrate of straßmannite, with different structure
Triclinic: $P \overline{1}$ ; structure determined
a= 7.193(2), b= 11.760(2), c= 11.792(2) Å, α= 67.20(3), β= 107.76(3), γ= 89.99(3)^∘
10.24(100), 6.76(10), 5.40(14), 5.11(54), 3.618(8), 3.405(11), 3.348(7), 3.065(11)
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 5756/1
How to cite: Kasatkin, A. V., Plášil, J., Chukanov, N. V., Škoda, R., Nestola, F., Agakhanov, A. A., and Belakovskiy, D. I.: Gurzhiite, IMA 2021-086, in: CNMNC Newsletter 65, Eur. J. Mineral., 34, https://doi.org/10.5194/ejm-34-143-2022, 2022.

IMA no. 2021-088

Bolotinaite
Bltn
(Na₇□)(Al₆Si₆O₂₄)F•4H₂O
In den Dellen (Zieglowski) pumice quarry, 1.5 km northeast of Mendig, Laach Lake (Laacher See) paleovolcano, Eifel region, Rhineland-Palatinate, Germany (50^∘23^′34^′′ N, 7^∘17^′04^′′ E)
Nikita V. Chukanov*, Natalia V. Zubkova, Christof Schäfer, Igor V. Pekov, Marina F. Vigasina, Dmitry I. Belakovskiy, Sergey N. Britvin, Vasiliy O. Yapaskurt, and Dmitry Y. Pushcharovsky
*E-mail: nikchukanov@yandex.ru
Sodalite group
Cubic: $I \overline{4}$ 3m; structure determined
a= 9.0228(1) Å
6.36(47), 4.502(10), 3.679(100), 2.851(28), 2.603(29), 2.126(18), 1.770(7), 1.595(7)
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 5754/1
How to cite: Chukanov, N. V., Zubkova, N. V., Schäfer, C., Pekov, I. V., Vigasina, M. F., Belakovskiy, D. I., Britvin, S. N., Yapaskurt, V. O., and Pushcharovsky, D. Y.: Bolotinaite, IMA 2021-088, in: CNMNC Newsletter 65, Eur. J. Mineral., 34, https://doi.org/10.5194/ejm-34-143-2022, 2022.

IMA no. 2021-089

Sulfatoredmondite
Srdm
[Pb₈O₂Zn(OH)₆](SO₄)₄•6H₂O
Redmond mine, Haywood Co., North Carolina, USA (35^∘40^′49^′′ N, 83^∘01^′07^′′ W)
Anthony R. Kampf*, Jason B. Smith, John M. Hughes, Chi Ma, and Christopher Emproto
*E-mail: akampf@nhm.org
Structurally related to redmondite and hydroredmondite
Monoclinic: $C 2 / m$ ; structure determined
a= 17.294(2), b= 7.3668(9), c= 12.727(2) Å, β= 110.622(9)^∘
8.10(100), 6.23(48), 5.86(46), 3.115(78), 2.892(63), 2.779(63), 2.706(47), 1.827(46)
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 76181, 76182 and 76183
How to cite: Kampf, A. R., Smith, J. B., Hughes, J. M., Ma, C., and Emproto, C.: Sulfatoredmondite, IMA 2021-089, in: CNMNC Newsletter 65, Eur. J. Mineral., 34, https://doi.org/10.5194/ejm-34-143-2022, 2022.

2 New mineral proposals approved in January 2022

IMA no. 2021-090

Calcioancylite-(La)
Canc-La
(LaCa)(CO₃)₂(OH)(H₂O)
Gejiu intrusion, Honghe Hani and Yi Autonomous Prefecture, Yunnan Province, China (23^∘29^′40^′′ N, 103^∘04^′41^′′ E)
Yanjuan Wang, Xiangping Gu, Guochen Dong*, Zenqian Hou, Zhusen Yang, Guang Fan, Yufei Wang, Chao Tang, Yinhang Cheng, and Kai Qu
*E-mail: donggc@cugb.edu.cn
Ancylite group
Orthorhombic: Pmcn; structure determined
a= 5.0253(3), b= 8.5152(6), c= 7.2717(6) Å
4.322(75), 3.693(68), 2.956(80), 2.640(47), 2.520(55), 2.335(100), 2.077(44), 2.012(42)
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 M16129
How to cite: Wang, Y., Gu, X., Dong, G., Hou, Z., Yang, Z., Fan, G., Wang, Y., Tang, C., Cheng, Y., and Qu, K.: Calcioancylite-(La), IMA 2021-090, in: CNMNC Newsletter 65, Eur. J. Mineral., 34, https://doi.org/10.5194/ejm-34-143-2022, 2022.

IMA no. 2021-091

Cubothioplumbite
Ctpb
[Pb₄(OH)₄]Pb(S₂O₃)₃
Redmond mine, Haywood Co., North Carolina, USA (35^∘40^′49^′′ N, 83^∘01^′07^′′ W)
Anthony R. Kampf*, Jason B. Smith, John M. Hughes, Chi Ma, and Christopher Emproto
*E-mail: akampf@nhm.org
A dimorph of hexathioplumbite (IMA no. 2021-092; this newsletter)
Cubic: Pa $\overline{3}$ ; structure determined
a= 14.918(1) Å
5.28(56), 3.732(57), 3.619(100), 3.346(64), 3.262(81), 2.490(92), 1.803(52), 1.700(49)
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 76184, 76185 and 76186
How to cite: Kampf, A. R., Smith, J. B., Hughes, J. M., Ma, C., and Emproto, C.: Cubothioplumbite, IMA 2021-091, in: CNMNC Newsletter 65, Eur. J. Mineral., 34, https://doi.org/10.5194/ejm-34-143-2022, 2022.

IMA no. 2021-092

Hexathioplumbite
Htpb
[Pb₄(OH)₄]Pb(S₂O₃)₃
Redmond mine, Haywood Co., North Carolina, USA (35^∘40^′49^′′ N, 83^∘01^′07^′′ W)
Anthony R. Kampf*, Jason B. Smith, John M. Hughes, Chi Ma, and Christopher Emproto
*E-mail: akampf@nhm.org
A dimorph of cubothioplumbite (IMA no. 2021-091; this newsletter)
Hexagonal: P6₃; structure determined
a= 10.721(1), c= 8.6541(6) Å
6.32(67), 3.511(100), 3.359(70), 3.249(86), 2.733(77), 2.536(89), 2.476(43), 1.837(52)
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 76187, 76188 and 76189
How to cite: Kampf, A. R., Smith, J. B., Hughes, J. M., Ma, C., and Emproto, C.: Hexathioplumbite, IMA 2021-092, in: CNMNC Newsletter 65, Eur. J. Mineral., 34, https://doi.org/10.5194/ejm-34-143-2022, 2022.

IMA no. 2021-094

Ferrofettelite
Fftt
[Ag₆As₂S₇][Ag₁₀FeAs₂S₈]
Glasberg quarry, Nieder-Beerbach, Odenwald, Germany (49^∘47^′49^′′ N, 8^∘41^′38^′′ E)
Luca Bindi* and Robert T. Downs
*E-mail: luca.bindi@unifi.it
The Fe analogue of fettelite
Monoclinic: C2; structure determined
a= 26.011(2), b= 15.048(1), c= 15.513(1) Å, β= 90.40(1)^∘
3.18(50), 3.014(100), 3.004(60), 2.930(15), 2.755(40), 2.501(30), 2.484(20), 1.880(30)
Type material is deposited in the collections of the University of Arizona Gem and Mineral Museum, 115 N Church Ave., Tucson, AZ 85701, USA, catalogue number 22716
How to cite: Bindi, L., and Downs, R. T.: Ferrofettelite, IMA 2021-094, in: CNMNC Newsletter 65, Eur. J. Mineral., 34, https://doi.org/10.5194/ejm-34-143-2022, 2022.

IMA no. 2021-096

Franksousaite
Fns
PbCu(Se⁶⁺O₄)(OH)₂
El Dragón mine, Antonio Quijarro Province, Potosí Department, Bolivia (19^∘49^′15^′′ S, 65^∘55^′00^′′ W)
Hexiong Yang*, James A. McGlasson, Ronald B. Gibbs, and Robert T. Downs
*E-mail: hyang@arizona.edu
The Se⁶⁺ analogue of linarite
Monoclinic: P2 $_{1} / m$ ; structure determined
a= 9.8208(3), b= 5.7340(2), c= 4.7498(1) Å, β= 102.683(2)^∘
9.548(22), 4.917(24), 4.578(35), 3.602(60), 3.193(100), 3.150(50), 2.621(21), 1.828(21)
Type material is deposited in the collections of the University of Arizona Gem and Mineral Museum, 115 N Church Ave., Tucson, AZ 85701, USA, catalogue number 22713 (holotype), and the RRUFF Project, deposition number R210012 (cotype)
How to cite: Yang, H., McGlasson, J. A., Gibbs, R. B., and Downs, R. T.: Franksousaite, IMA 2021-096, in: CNMNC Newsletter 65, Eur. J. Mineral., 34, https://doi.org/10.5194/ejm-34-143-2022, 2022.

IMA no. 2021-097

Mariakrite
Mari
[Ca₄Al₂(OH)₁₂(H₂O)₄][Fe₂S₄]
Ca. 2 km south-east of the Hatrurim Junction (road no. 31), Hatrurim Basin, Negev Desert, Israel
Michail N. Murashko, Yevgeny Vapnik, Natalia S. Vlasenko, Oleg S. Vereshchagin, Yulia S. Shelukhina, Igor V. Pekov, and Sergey N. Britvin*
*E-mail: sbritvin@gmail.com
Hydrotalcite supergroup
Triclinic: $P \overline{1}$ ; structure determined
a= 5.7107(2), b= 9.9952(4), c= 10.9095(4) Å, α= 98.678(3), β= 90.100(3), γ= 90.019(3)^∘
10.83(100), 9.90(39), 5.42(75), 3.96(22), 3.523(19), 2.856(37), 2.400(23), 2.241(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 number 5694/1
How to cite: Murashko, M. N., Vapnik, Y., Vlasenko, N. S., Vereshchagin, O. S., Shelukhina, Y. S., Pekov, I. V., and Britvin, S. N.: Mariakrite, IMA 2021-097, in: CNMNC Newsletter 65, Eur. J. Mineral., 34, https://doi.org/10.5194/ejm-34-143-2022, 2022.

IMA no. 2021-098

Tetrahedrite-(Mn)
Ttr-Mn
Cu₆(Cu₄Mn₂)Sb₄S₁₃
Teine mine, Sapporo, Hokkaido, Japan (43^∘05^′58^′′ N, 141^∘ 11^′48^′′ E)
Koichi Momma*, Masaaki Shimizu, Yoko Kusaba, and Yoshiya Ohki
*E-mail: k-momma@kahaku.go.jp
Tetrahedrite group
Cubic: $I \overline{4}$ 3m; structure determined
a= 10.35953(6) Å
3.669(9), 2.995(100), 2.773(6), 2.593(15), 2.445(7), 1.893(6), 1.833(29), 1.563(12)
Type material is deposited in the mineralogical collections of the National Museum of Nature and Science, 4-1-1 Amakubo, Tsukuba, Ibaraki 305-0005, Japan, specimen number MSN-M49019
How to cite: Momma, K., Shimizu, M., Kusaba, Y., and Ohki, Y.: Tetrahedrite-(Mn), IMA 2021-098, in: CNMNC Newsletter 65, Eur. J. Mineral., 34, https://doi.org/10.5194/ejm-34-143-2022, 2022.

3 Nomenclature/classification proposals approved in January 2022

3.1 Revised formula for lithiomarsturite, LiCaMn₃Si₅O₁₄(OH)

In the IMA List of Minerals the chemical formula of lithiomarsturite is given as ${LiMn}_{2}^{2 +} {Ca}_{2} {Si}_{5} O_{14} (OH)$ . However, a crystal structure study carried out on holotype material (Am. Mineral., 75, 409–414, 1990) clearly shows that Ca is hosted at the 7-fold coordinated M4 site (^M4Ca_1.00), whereas Mn is the dominant constituent at the three 6-fold coordinated sites: ^M1Mn_1.00, ^M2(Mn_0.77Ca_0.23), and ^M3Mn_1.00. Accordingly, the end-member formula should be written as LiCaMn₃Si₅O₁₄(OH). This formula matches the formula of the related mineral marsturite, NaCaMn₃Si₅O₁₄(OH). This is an executive decision taken by the officers of the IMA-CNMNC.

3.2 IMA 21-I: a proposed correction to the formula of rouvilleite

Proposal 21-I is accepted, and the formula of rouvilleite is changed from Na₃CaMn²⁺(CO₃)₃F to Na₃Ca₂(CO₃)₃F.

3.3 IMA 21-J: redefinition of angastonite as an amorphous mineral

Proposal 21-J is accepted, and angastonite is redefined as an amorphous mineral species, with the ideal formula CaMgAl₂(PO₄)₂(OH)₄•7H₂O.

3.4 IMA 21-K: grandviewite, Cu₃Al₂(SO₄)(OH)₁₀•H₂O: proposal for its redefinition

Proposal 21-K is accepted, and grandviewite is redefined as a hydrated copper–aluminum hydroxy-sulfate, having the ideal formula Cu₃Al₂(SO₄)(OH)₁₀•H₂O (Z= 2) and a triclinic symmetry, with space group $P \overline{1}$ , a= 6.002(3), b= 10.54(3), c= 11.249(8) Å, α= 72.1(2), β= 81.6(6), γ= 86.1(8)^∘.

3.5 IMA 21-L: discreditation of luinaite-(OH), (Na,□)(Fe²⁺,Mg)₃Al₆(BO₃)₃Si₆O₁₈(OH)₄, a mineral species of the tourmaline supergroup

Proposal 21-L is accepted, and luinaite-(OH) is discredited. This monoclinic tourmaline-type species, with a simplified composition (Na,□)(Fe²⁺,Mg)₃Al₆(BO₃)₃Si₆O₁₈(OH)₄, was approved with IMA number 2009-046. It is now considered a structurally similar polymorph of schorl, since it only differs in terms of a slight structural distortion from the typical trigonal tourmaline structure.

IMA Commission on New Minerals, Nomenclature and Classification (CNMNC) – Newsletter 65

IMA no. 2021-062a

IMA no. 2021-081

IMA no. 2021-082

IMA no. 2021-083

IMA no. 2021-084

IMA no. 2021-086

IMA no. 2021-088

IMA no. 2021-089

IMA no. 2021-090

IMA no. 2021-091

IMA no. 2021-092

IMA no. 2021-094

IMA no. 2021-096

IMA no. 2021-097

IMA no. 2021-098

3.1 Revised formula for lithiomarsturite, LiCaMn3Si5O14(OH)

3.2 IMA 21-I: a proposed correction to the formula of rouvilleite

3.3 IMA 21-J: redefinition of angastonite as an amorphous mineral

3.4 IMA 21-K: grandviewite, Cu3Al2(SO4)(OH)10•H2O: proposal for its redefinition

3.5 IMA 21-L: discreditation of luinaite-(OH), (Na,□)(Fe2+,Mg)3Al6(BO3)3Si6O18(OH)4, a mineral species of the tourmaline supergroup

3.1 Revised formula for lithiomarsturite, LiCaMn₃Si₅O₁₄(OH)

3.4 IMA 21-K: grandviewite, Cu₃Al₂(SO₄)(OH)₁₀•H₂O: proposal for its redefinition

3.5 IMA 21-L: discreditation of luinaite-(OH), (Na,□)(Fe²⁺,Mg)₃Al₆(BO₃)₃Si₆O₁₈(OH)₄, a mineral species of the tourmaline supergroup