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Mineralogical ClassificationNew minerals and nomenclature approved by IMA CNMNC in April and May 2019

24th May 2019 13:19 UTCMarco E. Ciriotti Manager

NEW MINERAL PROPOSALS APPROVED IN APRIL 2019


IMA No. 2018-141

Andymcdonaldite

Fe2TeO6

Wildcat prospect, NW portion of the Detroit District, Juab Co., Utah, USA

Mati Raudsepp*, Mark F. Coolbaugh, John K. McCormack, Edith Czech and Rhy McMillan

*E-mail: mraudsepp@eoas.ubc.ca

Known synthetic analogue

Tetragonal: P42/mnm

a = 4.6222(9), c = 9.077(3) Å

4.538(12), 4.119(35), 3.268(100), 2.652(10), 2.531(58), 2.311(13), 1.707(48), 1.634(14)

Type material is deposited in the mineralogical collections of the Smithsonian National Museum of Natural History, 10th St. & Constitution Ave., Washington, DC 20560, USA, catalogue number NMNH 177134

How to cite: Raudsepp, M., Coolbaugh, M.F., McCormack, J.K., Czech, E. and McMillan, R. (2019) Andymcdonaldite, IMA 2018-141. CNMNC Newsletter No. 49, June 2019, page xxx;

Mineralogical Magazine, 83, 323–328.


IMA No. 2018-142

Aluminosugilite

KNa2Al2Li3Si12O30

Cerchiara mine, Faggiona, Borghetto Vara-Pignone,

La Spezia, Liguria, Italy (44°11’57”N, 9°42’1”E)

Mariko Nagashima*, Chihiro Fukuda, Takashi

Matsumoto, Teruyoshi Imaoka, Gianluca Odicino

and Gianluca Armellino

*E-mail: nagashim@yamaguchi-u.ac.jp

Osumilite group

Hexagonal: P6/mcc; structure determined

a = 9.9830(4), c = 13.9667(5) Å

4.32(100), 4.06(38), 3.67(14), 3.48(30), 3.18(92),

2.86(70), 2.71(18), 2.49(18)

Type material is deposited in the mineralogical

collections of the National Museum of Nature and

Science, Tsukuba, Japan, specimen numbers NSMMF-

16503

How to cite: Nagashima, M., Fukuda, C., Matsumoto,

T., Imaoka, T., Odicino, G. and Armellino, G. (2019)

Aluminosugilite, IMA 2018-142. CNMNC

Newsletter No. 49, June 2019, page xxx;

Mineralogical Magazine, 83, 323-xxx.


IMA No. 2018-150

Siwaqaite

Ca6Al2(CrO4)3(OH)12·26H2O

North Siwaqa complex, Lisdan-Siwaqa Fault,

Hatrurim Complex, ca. 60 km S of Amman, Jordan

(31°24’15”N, 36°14’34”E)

Rafał Juroszek*, Biljana Krüger, Irina O. Galuskina,

Hannes Krüger, Yevgeny Vapnik and Evgeny V.

Galuskin

*E-mail: rjuroszek@us.edu.pl

The Cr analogue of ettringite

Trigonal: P31c; structure determined

a = 11.3640(2), c = 21.4485(2) Å

9.841(100), 5.682(65), 5.021(16), 4.709(38),

3.900(29), 3.280(17), 3.279(33), 2.224(16)

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 5277/1

How to cite: Juroszek, R., Krüger, B., Galuskina,

I.O., Krüger, H., Vapnik, Y. and Galuskin, E.V.

(2019) Siwaqaite, IMA 2018-150. CNMNC

Newsletter No. 49, June 2019, page xxx;

Mineralogical Magazine, 83, 323–328.


IMA No. 2018-154

Luxembourgite

AgCuPbBi4Se8

Bivels, Luxembourg (49°57’8”N, 6°10’41”E)

Simon Philippo, Frédéric Hatert*, Yannick Bruni and

Pietro Vignola

*E-mail: fhatert@uliege.be

Isostructural with watkinsonite and litochlebite

Monoclinic: P21/m; structure determined

a = 13.002(1), b = 4.1543(3), c = 15.312(2) Å, β =

108.92(1)°

4.61(20), 3.59(20), 2.984(100), 2.425(20), 2.085(60),

1.916(20), 1.355(30), 1.188(30)

Type material is deposited in the mineralogical

collections of the Natural History Museum of

Luxembourg, Rue Münster 25, L-2560 Luxembourg,

Luxembourg, catalogue number FD040, and the

Laboratory of Mineralogy, University of Liège,

Bâtiment B18, Sart Tilman, B-4000 Liège, Belgium,

catalogue number 21302

How to cite: Philippo, S., Hatert, F., Bruni, Y. and

Vignola, P. (2019) Luxembourgite, IMA 2018-154.

CNMNC Newsletter No. 49, June 2019, page xxx;

Mineralogical Magazine, 83, 323–328.


IMA No. 2018-156

Tsikourasite

Mo3Ni2P1+x (x < 0.25)

Agios Stefanos mine, ca. 10 km S of the Domokos

village, Othrys ophiolite, Greece (39°4’59”N,

22°25’59”E)

Federica Zaccarini*, Luca Bindi, Elena Ifandi, Tassos

Grammatikopoulos, Chris J. Stanley, Giorgio Garuti

and Daniela Mauro

*E-mail: Federica.Zaccarini@unileoben.ac.at

Known synthetic analogue

Cubic: F 4 3m; structure determined

a = 10.8215(5) Å

2.705(20), 2.483(18), 2.209(65), 2.083(100),

1.913(32), 1.803(12), 1.275(26), 1.089(12)

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 3296/I

How to cite: Zaccarini, F., Bindi, L., Ifandi, E.,

Grammatikopoulos, T., Stanley, C.J., Garuti, G. and

Mauro, D. (2019) Tsikourasite, IMA 2018-156.

CNMNC Newsletter No. 49, June 2019, page xxx;

Mineralogical Magazine, 83, 323–328.


IMA No. 2018-157

Laurentthomasite

Mg2K(Be2Al)Si12O30

40 km E of the village of Betroka, in a rural

area named Beravina, close to the small village of

Ambaro, Toliara province, Madagascar (23°21’0”S,

46°25’0”E)

Cristiano Ferraris*, Isabella Pignatelli, Fernando

Cámara, Sylvain Ponti, Martin Schreyer, Gian Carlo

Parodi and Fengxia Wei

*E-mail: ferraris@mnhn.fr

The Mg analogue of milarite

Hexagonal: P6/mcc; structure determined

a = 9.95343(6), c = 14.15583(8) Å

7.055(2), 4.965(6), 4.302(2), 4.064(8), 3.533(3),

3.171(10), 2.881(8), 2.372(4)

Type material is deposited in the mineralogical

collections of the Muséum National d’Histoire

Naturelle, 61 rue Buffon, 75005 Paris, France,

catalogue numbers 218.1_a (holotype), 218.1_b and 218.1_c (cotypes)

How to cite: Ferraris, C., Pignatelli, I., Cámara, F., Ponti, S., Schreyer, M., Parodi, G.C. and Wei, F. (2019) Laurentthomasite, IMA 2018-157. CNMNC Newsletter No. 49, June 2019, page xxx; Mineralogical Magazine, 83, 323–328.


IMA No. 2018-158

Kahlenbergite

KAl11O17

Ca. 300 m NE of the Parsa Mt, Negev Desert, Hatrurim Basin, Israel (31°12.18’N, 36°15.31’E)

Biljana Krüger*, Evgeny V. Galuskin, Irina O. Galuskina, Hannes Krüger and Yevgeny Vapnik

*E-mail: biljana.krueger@uibk.ac.at

The K analogue of diaoyudaoite

Hexagonal: P63/mmc; structure determined

a = 5.64860(6), c = 22.8970(3) Å

11.448(100), 5.724(15), 2.824(14), 2.719(34), 2.533(26), 2.059(12), 1.610(13), 1.412(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 5295/1

How to cite: Krüger, B., Galuskin, E.V., Galuskina, I.O., Krüger, H. and Vapnik, Y. (2019) Kahlenbergite, IMA 2018-158. CNMNC Newsletter No. 49, June 2019, page xxx; Mineralogical Magazine, 83, 323–328.


IMA No. 2018-159

Scorticoite

Mn6(Sb☐)Σ2(SiO4)2O3(OH)3

Scortico Mn ore deposit, Fivizzano, Apuan Alps, Massa Carrara, Tuscany, Italy (44°07’39”N, 10°07’12”E)

Cristian Biagioni*, Elena Bonaccorsi, Anthony R. Kampf, Federica Zaccarini, Ulf Hålenius and Ferdinando Bosi

*E-mail: cristian.biagioni@unipi.it

Welinite group

Trigonal: P3; structure determined

a = 8.205(1), c = 4.774(1) Å

3.105(s), 2.858(s), 2.676(ms), 2.332(ms), 1.787(s), 1.685(m), 1.552(m)

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 19908

How to cite: Biagioni, C., Bonaccorsi, E., Kampf, A.R., Zaccarini, F., Hålenius, U. and Bosi, F. (2019) Scorticoite, IMA 2018-159. CNMNC Newsletter No. 49, June 2019, page xxx; Mineralogical Magazine, 83, 323–328.


IMA No. 2018-160

Potassic-hastingsite

KCa2(Fe2+4Fe3+)(Si6Al2)O22(OH)2

Danailingou, Tongxing town, Keshiketeng Banner, Inner Mongolia, China (43°43’18”N, 117°34’37”E)

Guangming Ren*, Guowu Li, Jiaxin Shi, Xiangping Gu, Guang Fan, Apeng Yu, Qiuxiao Liu and Ganfu Shen

*E-mail: rguangming928@sina.com

Amphibole supergroup

Monoclinic: C2/m; structure determined

a = 9.9405(7), b = 18.256(2), c = 5.3501(3) Å, β = 105.117(5)°

8.504(100), 3.417(36), 3.155(63), 2.735(71), 2.623(35), 2.570(34), 2.365(29), 2.179(30)

Type material is deposited in the mineralogical collections of the Geological Museum of China, Beijing, China, catalogue number M13815

How to cite: Ren, G., Li, G., Shi, J., Gu, X., Fan, G.,Yu, A., Liu, Q. and Shen, G. (2019) Potassic-hastingsite, IMA 2018-160. CNMNC Newsletter No. 49, June 2019, page xxx; Mineralogical Magazine, 83, 323–328.


IMA No. 2018-161

Rumoiite

AuSn2

Minamichiyoda, Shosanbetsu village, Rumoi Subprefecture, Hokkaido, Japan (44°31’21”N, 141°46’51”E)

Daisuke Nishio-Hamane* and Katsuyuki Saito

*E-mail: hamane@issp.u-tokyo.ac.jp

Known synthetic analogue

Orthorhombic: Pbca

a = 6.905(2), b = 7.017(2), c = 11.797(3) Å

4.542(58), 3.774(48), 2.950(100), 2.711(52), 2.409(41), 2.244(56), 2.136(47), 2.123(65)

Type material is deposited in the mineralogical collections of the National Museum of Nature and Science, Tsukuba, Japan, specimen number NSM-M46178 (holotype) and M46179 (cotype)

How to cite: Nishio-Hamane, D. and Saito, K. (2019) Rumoiite, IMA 2018-161. CNMNC Newsletter No. 49, June 2019, page xxx; Mineralogical Magazine, 83, 323–328.


IMA No. 2018-162

Shosanbetsuite

Ag3Sn

Minamichiyoda, Shosanbetsu village, Rumoi Subprefecture, Hokkaido, Japan (44°31’21”N, 141°46’51”E)

Daisuke Nishio-Hamane* and Katsuyuki Saito

*E-mail: hamane@issp.u-tokyo.ac.jp

Known synthetic analogue

Orthorhombic: Pmmn

a = 5.998(5), b = 4.7736(9), c = 5.154(3) Å

2.592(10), 2.586(7), 2.389(30), 2.275(100), 2.267(85), 1.756(78), 1.356(73), 1.354(53)

Type material is deposited in the mineralogical collections of the National Museum of Nature and Science, Tsukuba, Japan, specimen number NSM-M46178 (holotype) and M46179 (cotype)

How to cite: Nishio-Hamane, D. and Saito, K. (2019) Shosanbetsuite, IMA 2018-162. CNMNC Newsletter No. 49, June 2019, page xxx; Mineralogical Magazine, 83, 323–328.


IMA No. 2018-165

Giacovazzoite

K5Fe3+3O(SO4)6·10H2O

Monte Arsiccio mine, Stazzema (LU), Apuan Alps, Tuscany, Italy (43°58’N, 10°17’E)

Cristian Biagioni*, Luca Bindi, Daniela Mauro and Marco Pasero

*E-mail: cristian.biagioni@unipi.it

Known synthetic analogue

Monoclinic: P21/c; structure determined

a = 9.4797(2), b = 18.4454(5), c = 18.0540(4) Å, β = 92.626(2)°

9.1(s), 8.2(vs), 4.15(mw), 4.02(mw), 3.442(m), 3.371(m), 3.005(m), 2.968(m)

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 19896

How to cite: Biagioni, B., Bindi, L., Mauro, D. and Pasero, M. (2019) Giacovazzoite, IMA 2018-165. CNMNC Newsletter No. 49, June 2019, page xxx; Mineralogical Magazine, 83, 323–328.


IMA No. 2018-166

Pseudomeisserite-(NH4)

(NH4)2Na4[(UO2)2(SO4)5]·4H2O

Blue Lizard mine, Red Canyon, White Canyon District, San Juan Co., Utah, USA (37°33’26”N, 110°17’44”W)

Anthony R. Kampf*, Travis A. Olds, Jakub Plášil, Barbara P. Nash and Joe Marty

*E-mail: akampf@nhm.org

New structure type

Monoclinic: P21/c; structure determined

a = 13.1010(3), b = 10.0948(2), c = 19.494(1) Å, β = 104.285(7)°

12.69(76), 8.88(55), 6.83(84), 6.01(100), 4.593(51), 4.414(57), 3.959(67), 3.135(76)

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 67621 and 67622

How to cite: Kampf, A.R., Olds, T.A., Plášil, J., Nash, B.P. and Marty, J. (2019) Pseudomeisserite-(NH4), IMA 2018-166. CNMNC Newsletter No. 49, June 2019, page xxx; Mineralogical Magazine, 83, 323–328.


IMA No. 2018-167

Gobelinite

CoCu4(SO4)2(OH)6·6H2O

Cap Garonne mine (pillar 78b in the north mine), Var, Provence-Alpes-Côte d’Azur, France (43°4’53”N, 6°1’55”E – type locality); Schlänger und Eichert vein of the Eisenzecher Zug mine, Eiserfeld, Siegerland, North Rhine-Westphalia, Germany (50°49’9”N, 7°59’14”E – cotype locality)

Stuart J. Mills*, Uwe Kolitsch, Georges Favreau, William D. Birch, Valérie Galea-Clolus and Johannes Markus Henrich

*E-mail: smills@museum.vic.gov.au

The Co analogue of ktenasite

Monoclinic: P21/c; structure determined

a = 5.599(1), b = 6.084(1), c = 23.676(5) Å, β = 95.22(3)°

11.870(100), 5.924(40), 4.883(10), 4.825(15), 3.946(15), 2.956(15), 2.663(20), 2.561(15)

Type material is deposited in the mineralogical collections of Geosciences, Museums Victoria, GPO Box 666, Melbourne, Victoria 3001, Australia, registration number M54565 (Cap Garonne), and the Naturhistorisches Museum, Burgring 7, A-1010 Wien, Austria, registration number O 1045 (Eisenzecher Zug)

How to cite: Mills, S.J., Kolitsch, U., Favreau, G., Birch, W.D., Galea-Clolus, V. and Henrich, J.M. (2019) Gobelinite, IMA 2018-167. CNMNC Newsletter No. 49, June 2019, page xxx; Mineralogical Magazine, 83, 323–328.


IMA No. 2018-108a

Fluorapophyllite-(Cs)

CsCa4(Si8O20)F(H2O)8

Darai-Pioz glacier, Alai mountain range, Tien-Shan, Rashtskii district, Tajikistan (39°30’N, 70°40’E)

Atali A. Agakhanov, Leonid A. Pautov, Anatoly V. Kasatkin, Elena Sokolova, Maxwell C. Day, Frank C. Hawthorne, Vladimir Y. Karpenko, Vyacheslav A. Muftakhov, Igor V. Pekov, Fernando Cámara Artigas and Sergey N. Britvin

*E-mail: atali99@mail.ru

Apophyllite group

Tetragonal: P4/nmc

a = 9.060(6), c = 15.741(11) Å

7.870(100), 3.935(100), 3.602(55), 2.974(84), 2.515(73), 2.486(71), 2.119(42), 2.030(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 5280/1

How to cite: Agakhanov, A.A., Pautov, L.A., Kasatkin, A.V., Sokolova, E., Day, M.C., Hawthorne, F.C., Karpenko, V.Y., Muftakhov, V.A., Pekov, I.V., Cámara Artigas, F. and Britvin, S.N. (2019) Fluorapophyllite-(Cs), IMA 2018-108a. CNMNC Newsletter No. 49, June 2019, page xxx; Mineralogical Magazine, 83, 323–328.


NEW MINERAL PROPOSALS APPROVED IN MAY 2019


IMA No. 2019-001

Smamite

Ca2Sb(OH)4[H(AsO4)2]·6H2O

Giftgrube mine, St. Jacques vein, Rauenthal, Sainte Marie-aux-Mines, Haut-Rhin province, France (48°13’28”N, 7°9’7”E)

Jakub Plášil*, Anthony R. Kampf, Nicolas Meisser, Cédric Lheur, Thierry Brunsperger and Radek Škoda

*E-mail: plasil@fzu.cz

New structure type

Triclinic: P1; structure determined

a = 6.8207(4), b = 8.0959(4), c = 8.2130(6) Å, α =

95.834(7), β = 110.762(8), γ = 104.012(7)°

7.56(41), 6.03(60), 5.66(47), 5.07(100), 3.992(43),

3.783(36), 2.858(51), 2.766(31)

Type material is deposited in the mineralogical

collections of the Musée Cantonal de Géologie,

University of Lausanne, Anthropole, Dorigny, CH-

1015 Lausanne, Switzerland, catalogue number MGL

093481 (holotype), 093482 and 093481 (cotypes),

and the Natural History Museum of Los Angeles

County, 900 Exposition Boulevard, Los Angeles, CA

90007, USA, catalogue number 67169 (cotype)

How to cite: Plášil, J., Kampf, A.R., Meisser, N.,

Lheur, C., Brunsperger, T. and Škoda, R. (2019)

Smamite, IMA 2019-001. CNMNC Newsletter No.

49, June 2019, page xxx; Mineralogical Magazine,

83, 323–328.


IMA No. 2019-002

Caseyite

[(V5+O2)Al7.5(OH)15(H2O)13]2[H2V4+V5+9O28][V5+10O28]2·90H2O

West Sunday mine, Slick Rock district, San Miguel

Co., Colorado, USA (38°4’48.03”N,

108°49′18.07”W); Packrat mine, near Gateway, Mesa

Co., Colorado, USA (38°38’51.28”N,

109°2’49.77”W); Burro mine, Slick Rock district,

San Miguel Co., Colorado, USA (38°2’42”N,

108°53’23”W)

Anthony R. Kampf*, Mark A. Cooper, John M.

Hughes, Barbara P. Nash, Joe Marty and Frank C.

Hawthorne

*E-mail: akampf@nhm.org

New structure type

Monoclinic: P21/n; structure determined

a = 14.123(8), b = 31.00(1), c = 21.95(1) Å, β =

97.961(8)°

17.798(92), 15.499(100), 12.749(26), 12.620(33),

10.869(16), 9.332(11), 9.016(14), 8.899(43)

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 numbers 73526

(Packrat – holotype), 73527 and 73528 (Packrat –

cotypes), 73529 (West Sunday – cotype), 73530 and

73531 (Burro – cotypes)

How to cite: Kampf, A.R., Cooper, M.A., Hughes,

J.M., Nash, B.P., Marty, J. and Hawthorne, F.C.

(2019) Caseyite, IMA 2019-002. CNMNC

Newsletter No. 49, June 2019, page xxx;

Mineralogical Magazine, 83, 323–328.


IMA No. 2019-005

Langhofite

Pb2(OH)[WO4(OH)]

Långban deposit, Filipstad district, Värmland,

Sweden (59.85°N, 14.26°E, 215 m a.s.l.)

Dan Holtstam*, Fernando Cámara and Andreas Karlsson

*E-mail: dan.holtstam@nrm.se

New structure type

Triclinic: P1; structure determined

a = 6.6118(3), b = 7.0748(4), c = 7.3264(4) Å, α =

118.125(6), β = 94.503(5), γ = 101.146(5)°

6.04(24), 3.330(17), 3.259(22), 3.181(19), 3.079(24),

3.016(100), 2.053(20), 2.050(18)

Type material is deposited in the mineralogical

collections of the Department of Geosciences,

Swedish Museum of Natural History, Box 50007,

SE-104 05 Stockholm, Sweden, collection number

GEO-NRM 20030044

How to cite: Holtstam, D., Cámara, F. and Karlsson,

A. (2019) Langhofite, IMA 2019-005. CNMNC

Newsletter No. 49, June 2019, page xxx;

Mineralogical Magazine, 83, 323–328.


IMA No. 2019-006

Magnanelliite

K3Fe3+2(SO4)4(OH)(H2O)2

Monte Arsiccio mine, Stazzema, Apuan Alps,

Tuscany, Italy (43°58’N, 10°17’E)

Cristian Biagioni, Luca Bindi and Anthony R. Kampf

*E-mail: cristian.biagioni@unipi.it

The Fe3+ analogue of alcaparrosaite

Monoclinic: C2/c; structure determined

a = 7.5491(3), b = 16.8652(6), c = 12.1574(4) Å, β = 94.064(1)°

6.9(m), 4.91(mw), 3.612(mw), 3.427(mw),

3.300(mw), 3.085(s), 3.006(m), 2.704(m)

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 19894 (holotype), and the Natural

History Museum of Los Angeles County, 900

Exposition Boulevard, Los Angeles, CA 90007,

USA, catalogue number 67241 (cotype)

How to cite: Biagioni, C., Bindi, L. and Kampf, A.R.

(2019) Magnanelliite, IMA 2019-006. CNMNC

Newsletter No. 49, June 2019, page xxx;

Mineralogical Magazine, 83, 323–328.


NOMENCLATURE PROPOSALS APPROVED IN MARCH 2019


IMA 18-C: Redefinition of calumetite and discreditation of vondechenite


Proposal 18-C is accepted, and calumetite is redefined

from Cu(OH,Cl)2·2H2O to CaCu4(OH)8Cl2·3.5H2O.

Vondechenite (IMA2016-65), identical to calumetite, is

consequently discredited.


IMA 18-I: Nomenclature of minerals of the rhodonite group


Proposal 18-I is accepted, and the rhodonite group is

established. Currently it consists of two mineral species

having the following end-member formulae: rhodonite,

M5CaM1-M3Mn3M4MnSi5O15, and ferrorhodonite M5CaM1-M3Mn3M4FeSi5O15.


IMA 19-A: Redefinition of tsugaruite


Proposal 19-A is accepted, and tsugaruite is redefined as a lead-arsenic chloro-sulfosalt, having ideal formula Pb28As15S50Cl.


NOMENCLATURE PROPOSALS APPROVED IN APRIL 2019


IMA 18-H: Redefinition of cadwaladerite and discreditation of lesukite


Proposal 18-H is accepted, demonstrating that cadwaladerite and lesukite are the same mineral species. Because cadwaladerite has historical precedence, it is recognized as a valid mineral species, whereas lesukite is discredited. Furthermore, the formula of cadwaladerite is redefined as Al5(H2O)3(OH)12·n(Cl,H2O).


IMA 18-K: Nomenclature and classification of the tetrahedrite group


Proposal 18-K on the tetrahedrite group is accepted. The general structural formula of minerals belonging to this group is M(2)A6M(1)(B4C2)Σ6X(3)D4S(1)Y12S(2)Z (Z = 2), where A = Cu+, Ag+, ☐; B = Cu+, Ag+; C = Zn2+, Fe2+, Hg2+, Cd2+, Mn2+, Cu2+, Cu+, Fe3+; D = Sb3+, As3+, Bi3+, Te4+; Y = S2-, Se2-; and Z = S2-, Se2-, ☐. The tetrahedrite group is divided into five different series on the basis of the A, B, D, and Y constituents, i.e. the tetrahedrite, tennantite, freibergite, hakite, and giraudite series. The nature of the dominant C constituent is made explicit using a hyphenated suffix between parentheses. Eleven minerals belonging to the tetrahedrite group can be considered as valid species: argentotennantite-(Zn), argentotetrahedrite-(Fe), kenoargentotetrahedrite-(Fe), giraudite-(Zn), goldfieldite, hakite-(Hg), rozhdestvenskayaite-(Zn), tennantite-(Fe), tennantite-(Zn), tetrahedrite-(Fe), and tetrahedrite-(Zn). Furthermore, annivite is formally discredited.


IMA 19-B: Establishment of the calcioferrite group


Proposal 19-B on the calcioferrite group is accepted. The general formula of minerals belonging to this group is Ca4AB4(PO4)6(OH)4·12H2O, and two subgroups are defined on the basis of the dominant cation at the B site: the calcioferrite subgroup (B = Fe3+: calcioferrite, zodacite), and the montgomeryite subgroup (B = Al: montgomeryite, kingsmountite, fanfaniite). Aniyunwiyaite is discredited as being kingsmountite, which is assigned a triclinic structure with an ideal formula changed to Ca3MnFeAl4(PO4)6(OH)4·12H2O.


NOMENCLATURE PROPOSALS APPROVED IN MAY 2019


Application of the IMA-CNMNC dominant-valency rule to complex mineral compositions


This is special proposal, coauthored by all the officers of the CNMNC and approved by the members of the Commission itself. It is aimed at solving possible troubles in the definition of the ideal end-member formula of a mineral, which may be crucial for the definition of new mineral species. The IMA-CNMNC recommends the use of the dominant-valency rule for mineral nomenclature, because it alone may lead to unambiguous mineral identification. However, the simple application of the dominant-valency rule may sometimes result in unbalanced end-member formulae, due to the occurrence of a coupled heterovalent substitution at two sites along with a heterovalent substitution at a single site. In these cases, it is recommended to use the site total charge approach to identify the dominant root-charge arrangement on which the dominant-constituent rule can be applied.

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24th May 2019 13:29 UTCUwe Kolitsch Manager

> Nomenclature and classification of the tetrahedrite group


That was overdue - glad someone did the work necessary for establishing a new nomenclature.

24th May 2019 15:49 UTCJeff Weissman Expert

So, freibergite is now the awkward "kenoargentotetrahedrite-(Fe)"

24th May 2019 16:11 UTCKevin Conroy Manager

It just rolls off of the tongue, doesn't it?

24th May 2019 17:15 UTCRichard Gunter Expert

Is the low-iron tennantite from Kidd Creek now tennantite-(Zn)?

26th May 2019 14:17 UTCŁukasz Kruszewski Expert

Thanks, Marco. I've corrected some tetrahedrite group data, but I think we need to wait with kenoargentotetrahedrite-(Fe) and argentotennantite-(Zn) till the paper is available.

26th May 2019 14:56 UTCKevin Conroy Manager

Maybe they'll reconsider awkwardly naming minerals via chemistry, and instead stick to honoring someone or someplace. I shudder to think that a mineral like benstonite could have been bariocalciomagneseocarbonateite.

26th May 2019 16:14 UTCJolyon Ralph Founder

It could have been worse. Tennantite could have become Tetrahedrite-(Fe As)

26th May 2019 16:26 UTCDavid Von Bargen Manager

Kahlenbergite (should be at 35 degrees east instead of 36 - 36 puts it in Jordan)


Ca. 300 m NE of the Parsa Mt, Negev Desert, Hatrurim Basin, Israel (31°12.18’N, 35°15.31’E)

26th May 2019 16:35 UTCChester S. Lemanski, Jr.

Kenoargentotetrahedrite-(Fe) looks like the Hancockite fiasco round 2!!!

26th May 2019 16:52 UTCUwe Kolitsch Manager

No. There neither existed an approved clear definition of "freibergite" until

Welch, M.D., Stanley, C.J., Spratt, J., Mills, S.J. (2018): Rozhdestvenskayaite Ag10Zn2Sb4S13 and argentotetrahedrite Ag6Cu4(Fe2+,Zn)2Sb4S13: two Ag-dominant members of the tetrahedrite group. European Journal of Mineralogy 30, 1163-1172.

clarified the role of the Z-site occupancy.

26th May 2019 19:39 UTCKnut Edvard Larsen 🌟 Manager

Mineral and locality pages for all new minerals are updated.


The TL for Laurentthomasite is located in the Tsaraitso commune in the Betroka district.

26th May 2019 19:57 UTCFrank K. Mazdab 🌟 Manager

'Unnamed (Al-dominant analog of Sugilite)' listed for both the current Cerchiara mine type locality and for the N'Chwaning III mine locality should be rolled into the new aluminosugilite. I'm not sure how to do that. There is also additional analytical data accompanying the latter (N'Chwaning III) entry that should be incorporated into the new aluminosugilite page.

26th May 2019 20:21 UTCKnut Edvard Larsen 🌟 Manager

Frank, you can "roll" the unnamed into the new aluminosugilite by doing the following:

On the 'Unnamed (Al-dominant analog of Sugilite)- page go to edit.

Under Entry type: change from "Mineral/compound" to "Synonym". Wait a second, and under the new field that pops up, "Synonym of" write in: Aluminosugilite. Then save.

26th May 2019 20:43 UTCFrank K. Mazdab 🌟 Manager

Hi Knut. Thanks. That preserves the old 'Unnamed (Al-dominant analog of Sugilite) page. However, how will the additional locality and chemical data from that old page populate into the new aluminosugile page?

26th May 2019 21:28 UTCFrank Keutsch Expert

It is curious whether the Zn and Fe really make it a new mineral as I think they dominate a position. Similar there are Zn and Fe free tennantites and Cu over-substituted tennantites.


Freibergite could be different as it has only 12 sulfur due to Ag-Ag bonds, I think, so perhaps not part of this. Paper will show and I like forward to reading it...

26th May 2019 21:55 UTCUwe Kolitsch Manager

> Similar there are Zn and Fe free tennantites

They need to get approval first (you're thinking of the Mn-dominant fahlore, I guess?).

26th May 2019 21:55 UTCUwe Kolitsch Manager

> However, how will the additional locality and chemical data from that old page populate into the new aluminosugile page?


This can be done only manually by copy-paste.

26th May 2019 22:12 UTCFrank Keutsch Expert

No I meant this tennantite: "CRYSTAL STRUCTURE OF COPPER-RICH UNSUBSTITUTED TENNANTITE, Cu12.5As4S13" The Canadian Mineralogist Vol. 43, pp. 679-688 (2005), Makovicky et al.


Frank

26th May 2019 22:17 UTCFrank Keutsch Expert

Well, and also there is tennantite-Mn etc., but I guess that would have to be approved, but for the Cu12.5AS4S13 the structure exists so I am not sure why a special proposal for a name would be needed, sounds more like a redefinition as it "counted" as tennantite, but I am not IMA rule expert...

26th May 2019 22:25 UTCFrank K. Mazdab 🌟 Manager

Thanks Uwe... then will do so later this afternoon.


EDIT: done... copied over analytical data from old entry to new entry, deleted old entry from N'Chwaning III locality page, and cleared cache to properly populate updated locality in the new entry.

26th May 2019 22:55 UTCJolyon Ralph Founder

> > However, how will the additional locality and chemical data from that old page populate into the new aluminosugile page?


Not now. What should have been done is the Unnamed (Al-dominant analog of Sugilite) page should have been edited and renamed to the new mineral name, rather than a new page being added for it. But because that wasn't done right all the data have to be moved manually and then deleted from the old page, which actually should probably be entirely deleted at some point. An 'Unnamed' Entry isn't a synonym. It's a holder for something that doesn't have a name. When the name appears, it should be replaced.

26th May 2019 22:56 UTCJolyon Ralph Founder

I haven't checked what's been entered but it may still be more practical (eg with localities added) to remove the NEW page that was added and re-edit the old 'Unnamed' page now.

26th May 2019 23:16 UTCFrank K. Mazdab 🌟 Manager

I think it's all fixed now (except that the "unnamed" remains a synonym... I'll leave deleting that to someone else [in part because I don't think I can do that]). Since there were only two localities, it was easy to fix. I also copied over the old Cabella et al.,1990 reference for the Italian version of the unnamed mineral (my reference was for the South African version) into the new aluminosugilite page. The aluminosugilite page should be all good to go now.


I think the original issue here was that when the new aluminosugilite page was created, the creator (Knut?) didn't know that a previous page for the unnamed mineral existed. I think it's easy to miss those sorts of things because it isn't always clear that an "unnamed" mineral is indeed equivalent to what gets later named... it's always possible a new mineral is similar to but not identical to an already listed unnamed mineral, so it'll always take a little bit of hunting around to ensure only a true duplicate is replaced.


EDIT: in any case, it's safe to delete "unnamed (Al-dominant analog of sugilite)" as now everything (analytical data, old references, comments, etc.) have now all been transferred to the new aluminosugilite page. I don't know how to delete a mineral page.

27th May 2019 06:58 UTCAlfredo Petrov Manager

Frank, the only way to delete a mineral page is to replace it with something else. For example, you could replace the name with the german or french (or any other language) version of the name and make that a synonym.

27th May 2019 07:06 UTCFrank K. Mazdab 🌟 Manager

Thanks Alfredo. Hmm... then maybe for the short term it might just be better to leave it as is (as it is technically listed as a synonym now).

27th May 2019 09:01 UTCMarco E. Ciriotti Manager

Probably all "sugilites" from Cerchiara mine are aluminosugilite.

At today sugilite from Cerchiara deserve a (?).

27th May 2019 10:28 UTCUwe Kolitsch Manager

What designation exactly did Cabella et al. (1990) use for the then unnamed phase?

27th May 2019 10:30 UTCFrank K. Mazdab 🌟 Manager

Hi Marco,


I'll leave demoting sugilite at Cerchiara up to you.


I have question for you about the mentioned kenoargentotetrahedrite-(Fe)... would its end-member formula be: (Ag42)Cu4Fe2+2Sb4S12

27th May 2019 10:32 UTCFrank K. Mazdab 🌟 Manager

Hi Uwe,


they referred to it as "Al-rich, Fe-poor manganoan sugilite..." in the title.

15th Jul 2019 10:25 UTCUwe Kolitsch Manager

"IMA 18-I: Nomenclature of minerals of the rhodonite group


Proposal 18-I is accepted, and the rhodonite group is

established. Currently it consists of two mineral species

having the following end-member formulae: rhodonite,
M5CaM1-M3Mn3M4MnSi5O15, and ferrorhodonite M5CaM1-M3Mn3M4FeSi5O15."


There is some contradiction with the latest IMA list (July 2019; http://cnmnc.main.jp/) which still has the simplified rhodonite formula MnSiO3.

15th Jul 2019 10:31 UTCFrank K. Mazdab 🌟 Manager

Hi Uwe,


I hope you don't mind, but I superscripted and subscripted the formulas in your post to make them easier to read.

15th Jul 2019 10:34 UTCUwe Kolitsch Manager

Thanks, Frank!

15th Jul 2019 10:35 UTCUwe Kolitsch Manager

Another thing: the latest IMA list still has the old tsugaruite formula.
 
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