Eur. J. Mineral., 34, 143–148, 2022
https://doi.org/10.5194/ejm-34-143-2022© Author(s) 2022. This work is distributed under
the Creative Commons Attribution 4.0 License.

IMA Commission on New Minerals, Nomenclature andClassification (CNMNC) – Newsletter 65
Ritsuro Miyawaki1 , Frédéric Hatert2 , Marco Pasero3 , and Stuart J. Mills4
1 Chairman, CNMNC | Department of Geology, National Museum of Nature and Science,

4-1-1 Amakubo, Tsukuba 305-0005, Japan
2 Vice-Chairman, CNMNC | Laboratoire de Minéralogie, Université de Liège, Bâtiment B18,

Sart Tilman, 4000 Liège, Belgium
3 Vice-Chairman, CNMNC | Dipartimento di Scienze della Terra, Università di Pisa,

Via Santa Maria 53, 56126 Pisa, Italy
4 Secretary, CNMNC | Geosciences, Museum Victoria, P.O. Box 666, Melbourne,

Victoria 3001, Australia
Correspondence: Marco Pasero (marco.pasero@unipi.it)
Published: 24 February 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;

Citation details concern the fact that this information will
be published in the European Journal of Mineralogy on aroutine basis, as well as being added month by month to thecommission’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– type locality;– full authorship of proposal;– e-mail address of corresponding author;– relationship to other minerals;– crystal system, space group, structure determined, yesor 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 offull description.

Slyudyankaite
Sdy
Na28 Ca4 (Si24 Al24 O96 )(SO4 )6 (S6 )1/3 (CO2 ) q2H2 O
Malo-Bystrinskoe deposit, Baikal Lake area, eastern Siberia,
Russia (51◦ 400 5000 N, 103◦ 250 1800 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: P 1; 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)Published by Copernicus Publications on behalf of the European mineralogical societies DMG, SEM, SIMP & SFMC.

144
Type material is deposited in the collections of theSidorov 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
Ca4 Fe2+ Sn3 (Si2 O7 )2 (Si2 O6 OH)2
In a pegmatite of the Karkonosze granite, Szklarska
Por˛eba Huta quarry, Lower Silesia, Poland (50◦ 490 4000 N,
15◦ 290 2200 E)
Adam
Pieczka*,
SylwiaZelek-Pogudz,Bożena
Goł˛ebiowska, Katarzyna M. Stadnicka, and R. JamesEvans*E-mail: pieczka@agh.edu.pl
Kristiansenite group
Triclinic (pseudomonoclinic): C1; structure determineda = 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., Goł˛ebiowska,
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+ V2 O6 Cl q2H2 O
Toludskoe lava field, 2012–2013 Tolbachik Fissure Eruption,
Plosky Tolbachik volcano, Kamchatka, Russia (55◦ 450 0200 N,
160◦ 190 4100 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: P 21 /c; structure determineda = 7.1863(2),b = 10.1147(3),c = 12.7252(4) Å,
β = 106.243(3)◦Eur. J. Mineral., 34, 143–148, 2022

R. Miyawaki et al.: CNMNC Newsletter 65
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-34-1432022, 2022.
IMA no. 2021-083
Tennantite-(Cd)
Tnt-CdCu6 (Cu4 Cd2 )As4 S13
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 43m; structure determineda = 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 ofMineralogy 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 2021083, in: CNMNC Newsletter 65, Eur. J. Mineral., 34,
https://doi.org/10.5194/ejm-34-143-2022, 2022.
IMA no. 2021-084
HösliteHösqFe3+
3 (VO4 )2 (SO4 )(OH)(H2 O)4 3H2 O
Struhadlo deposit, near the Struhadlo village, 10 km west of
Klatovy, Plzeň region, Southern Bohemia, Czech Republic(49◦ 230 51.1100 N, 13◦ 110 20.6100 E)
Pavel Škácha*, Jiří Sejkora, Gwladys Steciuk, Jakub Plášil,and Radek Škoda
*E-mail: skachap@seznam.cz
Structurally similar to schubnelite
Monoclinic: P 21 /c; structure determined
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R. Miyawaki et al.: CNMNC Newsletter 65
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., andŠkoda, R.: Höslite, IMA 2021-084, in: CNMNC Newsletter
65, Eur. J. Mineral., 34, https://doi.org/10.5194/ejm-34-1432022, 2022.
IMA no. 2021-086
Gurzhiite
Grz
Al(UO2 )(SO4 )2 F q10H2 O
495 m level of the underground Mine 2, Bykogorskoe U deposit, Byk Mountain, Stavropol Krai, Northern Caucasus,
Russia (44◦ 110 05.400 N, 42◦ 570 31.500 E)
Anatoly V. Kasatkin*, Jakub Plášil, Nikita V. Chukanov,Radek Škoda, Fabrizio Nestola, Atali A. Agakhanov, andDmitry I. Belakovskiy*E-mail: anatoly.kasatkin@gmail.com
A lower hydrate of straßmannite, with different structure
Triclinic: P 1; structure determineda = 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-34-1432022, 2022.
IMA no. 2021-088
Bolotinaite
Bltn(Na7 )(Al6 Si6 O24 )F q4H2 O
In den Dellen (Zieglowski) pumice quarry, 1.5 km northeast of Mendig, Laach Lake (Laacher See) paleovolcano,
Eifel region, Rhineland-Palatinate, Germany (50◦ 230 3400 N,
7◦ 170 0400 E)
Nikita V. Chukanov*, Natalia V. Zubkova, Christof Schäfer,Igor V. Pekov, Marina F. Vigasina, Dmitry I. Belakovskiy,
https://doi.org/10.5194/ejm-34-143-2022

145
Sergey N. Britvin, Vasiliy O. Yapaskurt, and Dmitry Y.
Pushcharovsky*E-mail: nikchukanov@yandex.ru
Sodalite group
Cubic: I 43m; 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[Pb8 O2 Zn(OH)6 ](SO4 )4 q6H2 O
Redmond mine, Haywood Co., North Carolina, USA(35◦ 400 4900 N, 83◦ 010 0700 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: C2/m; structure determineda = 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 collectionsof 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 2021089, 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)(H2 O)
Gejiu intrusion, Honghe Hani and Yi Autonomous Prefecture, Yunnan Province, China (23◦ 290 4000 N, 103◦ 040 4100 E)
Eur. J. Mineral., 34, 143–148, 2022

146
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 determineda = 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-34-1432022, 2022.
IMA no. 2021-091
Cubothioplumbite
Ctpb[Pb4 (OH)4 ]Pb(S2 O3 )3Redmond mine, Haywood Co., North Carolina, USA(35◦ 400 4900 N, 83◦ 010 0700 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; thisnewsletter)Cubic: Pa3; structure determineda = 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 collectionsof 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 2021091, 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(S2 O3 )3Redmond mine, Haywood Co., North Carolina, USA(35◦ 400 4900 N, 83◦ 010 0700 W)
Anthony R. Kampf*, Jason B. Smith, John M. Hughes, Chi
Ma, and Christopher Emproto
Eur. J. Mineral., 34, 143–148, 2022

R. Miyawaki et al.: CNMNC Newsletter 65*E-mail: akampf@nhm.org
A dimorph of cubothioplumbite (IMA no. 2021-091; thisnewsletter)
Hexagonal: P 63 ; structure determineda = 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 collectionsof 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 2021092, in: CNMNC Newsletter 65, Eur. J. Mineral., 34,
https://doi.org/10.5194/ejm-34-143-2022, 2022.
IMA no. 2021-094
Ferrofettelite
Fftt[Ag6 As2 S7 ][Ag10 FeAs2 S8 ]Glasberg quarry, Nieder-Beerbach, Odenwald, Germany(49◦ 470 4900 N, 8◦ 410 3800 E)
Luca Bindi* and Robert T. Downs*E-mail: luca.bindi@unifi.it
The Fe analogue of fettelite
Monoclinic: C2; structure determineda = 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 Universityof 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◦ 490 1500 S, 65◦ 550 0000 W)
Hexiong Yang*, James A. McGlasson, Ronald B. Gibbs, andRobert T. Downs*E-mail: hyang@arizona.edu
The Se6+ analogue of linarite
Monoclinic: P 21 /m; structure determined
a = 9.8208(3),b = 5.7340(2),c = 4.7498(1) Å,
β = 102.683(2)◦https://doi.org/10.5194/ejm-34-143-2022

R. Miyawaki et al.: CNMNC Newsletter 65
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 2021096, in: CNMNC Newsletter 65, Eur. J. Mineral., 34,
https://doi.org/10.5194/ejm-34-143-2022, 2022.

147
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, 4-11 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-34143-2022, 2022.

IMA no. 2021-097
3Mariakrite
Mari[Ca4 Al2 (OH)12 (H2 O)4 ][Fe2 S4 ]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 1; structure determineda = 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 2021097, in: CNMNC Newsletter 65, Eur. J. Mineral., 34,
https://doi.org/10.5194/ejm-34-143-2022, 2022.

3.1

Nomenclature/classification proposals approved in
January 2022
Revised formula for lithiomarsturite,
LiCaMn3 Si5 O14 (OH)In the IMA List of Minerals the chemical formula oflithiomarsturite is given as LiMn2+
2 Ca2 Si5 O14 (OH). However, a crystal structure study carried out on holotype material (Am. Mineral., 75, 409–414, 1990) clearly showsthat Ca is hosted at the 7-fold coordinated M4 site
(M4 Ca1.00 ), whereas Mn is the dominant constituent at thethree 6-fold coordinated sites: M1 Mn1.00 , M2 (Mn0.77 Ca0.23 ),and M3 Mn1.00 . Accordingly, the end-member formula
should be written as LiCaMn3 Si5 O14 (OH). This formula
matches the formula of the related mineral marsturite,
NaCaMn3 Si5 O14 (OH). This is an executive decision takenby the officers of the IMA-CNMNC.
3.2

IMA 21-I: a proposed correction to the formula ofrouvilleite

Proposal 21-I is accepted, and the formula of rouvilleite ischanged from Na3 CaMn2+ (CO3 )3 F to Na3 Ca2 (CO3 )3 F.
3.3

IMA 21-J: redefinition of angastonite as anamorphous mineral

IMA no. 2021-098
Tetrahedrite-(Mn)
Ttr-MnCu6 (Cu4 Mn2 )Sb4 S13
Teine mine, Sapporo, Hokkaido, Japan (43◦ 050 5800 N,
141◦ 110 4800 E)
Koichi Momma*, Masaaki Shimizu, Yoko Kusaba, andYoshiya Ohki
*E-mail: k-momma@kahaku.go.jp
Tetrahedrite group
Cubic: I 43m; structure determineda = 10.35953(6) Åhttps://doi.org/10.5194/ejm-34-143-2022

Proposal 21-J is accepted, and angastonite is redefined
as an amorphous mineral species, with the ideal formula
CaMgAl2 (PO4 )2 (OH)4 q7H2 O.
3.4

IMA 21-K: grandviewite,
Cu3 Al2 (SO4 )(OH)10 qH2 O: proposal for its
redefinition

Proposal 21-K is accepted, and grandviewite is redefined as a
hydrated copper–aluminum hydroxy-sulfate, having the ideal
formula Cu3 Al2 (SO4 )(OH)10 qH2 O (Z = 2) and a triclinic
symmetry, with space group P 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)◦ .
Eur. J. Mineral., 34, 143–148, 2022

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3.5

R. Miyawaki et al.: CNMNC Newsletter 65
IMA 21-L: discreditation of luinaite-(OH),(Na, )(Fe2+ ,Mg)3 Al6 (BO3 )3 Si6 O18 (OH)4 , amineral 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)3 Al6 (BO3 )3 Si6 O18 (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 fromthe typical trigonal tourmaline structure.

Eur. J. Mineral., 34, 143–148, 2022

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