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Mineralogical ClassificationNew species approved (and nullified) by CNMMN

1st Jul 2005 12:15 UTCMarco E. Ciriotti

Some new species approved by CNMMN are in the new list of the IMA-CNMMN:

IMA No. 2005-012a

Fabi quarry, near Lanzada, Valmalenco, Sondrio, Lombardy, Italy

Francesco Demartin

NaBa3CaY(CO3)3(OH)6·3H2O

Donnayite group

Triclinic: P1; structure determined

IMA No. 2005-013

Helikon II pegmatite, Karibib, Namibia

Paul Keller

(Mn2+,Mn3+,Fe3+)2(PO4)O

Triplite/triploidite groups

Monoclinic: I2/a; structure determined

IMA No. 2005-014

Bayun Obo iron mine, Inner Mongolia, China

Xu Jinsha

(Ce,La)4Fe2+(Ti,Fe2+,Mg,Fe3+)2Ti2Si4O22

Chevkinite group

Monoclinic: P21/a (pseudo-C2/m); structure determined

IMA No. 2005-015a

Zhelezny mine, Kovdor carbonatite massif, Kola Peninsula, Russia

Sergey V. Britvin

Layered double hydroxide

Trigonal: P 3, P3, P 31m, P31m, P312, P321, P 3m1, P3m1

IMA No. 2005-016

Carrière de la Flèche, near Bertrix, Ardennes, Belgium

Frédéric Hatert

Ca2(Al,Fe2+,Mg)Al2(SiO4)(Si2O7)(OH,O)2·H2O

Pumpellyite group

Monoclinic: A2/m; structure determined

NOMENCLATURE MODIFICATION

IMA No. 05-B

The name of the mineral noélbensonite has been modified in noelbensonite.

NULLIFIED CNMMN DECISION

Proposal 2004-051, hydrous alumina, was approved by the CNMMN (see publications ‘Minerals approved in 2004). Several CNMMN members had asked, however, for a reexamination of akdalaite (69-002) which was approved as the first natural hydrous alumina. The authors of 2004-051 obtained holotype material of akdalaite from the Fersman museum in Moscow, and the re-examination showed that akdalaite and the material for 2004-051 are identical. The previously refined unit cell of akdalaite is incorrect, so that akdalaite and 2004-051 are actually the same mineral species. The name ‘akdalaite’ has priority; the fact that akdalaite was given a wrong space group does not necessitate a formal redefinition of this mineral. The re-examination and 2004-051 should be published as “New data and a new occurrence of akdalaite”. The approval decision of the CNMMN on 2004-051 is consequently nullified.

More at the web page of CNMMN: http://www.geo.vu.nl/users/ima-cnmmn/minerals2005.pdf

1st Jul 2005 15:14 UTCMarco E. Ciriotti

IMA 2005-016: formula and data are practically the same as pumpellyite-(Al) (Yoshiasa & Matsumoto, 1985).

The name and nomenclature was previously approved by CNMMN (Passaglia & Gottardi, 1973).

Ref:

• Passaglia E. & Gottardi G. (1973): Crystal chemistry and nomenclature of pumpellyites and julgoldites. Canadian Mineralogist, 12, 219-223.

• Yoshiasa, A. & Matsumoto, T. (1985): Crystal structure refinement and crystalchemistry of pumpellyite. American Mineralogist, 70, 1011-1019.

1st Jul 2005 15:47 UTCJim Ferraiolo

Hi Marco,

I noticed that as well.

Also:

IMA 2005-013 appears to be the manganese-manganese analog of stanekite Mn2+Fe3+(PO4)O

if the composition is written to balance:

Mn2+Mn3+(PO4)O

If I recall Paul Keller was first author on stanekite.

1st Jul 2005 20:29 UTCMarco E. Ciriotti

Yes Jim, I noted and classified it in the triplite <2M group>.

Ciao.

1st Jul 2005 20:42 UTCMarco E. Ciriotti

Sorry, I write an incorrect word in the previous message: please read <1M group>.

2nd Jul 2005 17:35 UTCMarco E. Ciriotti

A mineral with composition (PO4)O (IMA 2005-013) was found also at Boqueirãozinho pegmatite, Parelhas, Seridó Oriental, Rio Grande do Norte, Brazil in aggregates of black tabular crystals.

27th Jul 2005 07:57 UTCyqp

i want have new message about new minerals.thanks

23rd Sep 2005 01:56 UTCJeffrey

The author of IMA2005-014, Xu Jinsha, announced this new mineral with some basic but incomplete information under the Chinese name which transcribes as "Dingdaohengite-(Ce)". He even gives the CNMMN voting results on June 2 of this year. When we will see an English description is not indicated.

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