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Neue Mineralien Feb. 2010

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Stefan:
IMA No. 2009-086
Vico volcanic complex, Capranica, Viterbo Province, Latium, Italy
Athos Maria Callegari
KCaNaAl4B4Si2O18
New structure type
Monoclinic: P21
a = 4.8507(2), b = 16.6156(6), c = 20.5445(7) Å, β = 90.245(1)º /n; structure determined
4.104(90), 3.424(83), 3.234(100), 3.119(32), 2.425(31), 2.405(37), 2.184(38), 1.564(30)

IMA No. 2009-087
Silver Coin mine, Valmy, Humboldt County, Nevada, USA (40°55'44"N 117°19'26"W) and Huber open pit, Krásno, Czech Republic (50°06'N 12°48'E) (cotype localities)
Stuart Mills
Ca2Al7(PO4)2(PO3OH)2(OH,F)15·8H2
New structure type O
Trigonal: P321; structure determined
a = 6.988(1), c = 16.707(3) Å
16.739(100), 6.054(18), 5.687(13), 3.488(9), 2.967(45), 2.219(19), 1.896(13), 1.744(17)

IMA No. 2009-088
The chromite deposits of Nausahi, Keonjhar District, Orissa, India
Frank C. Hawthorne
NaCr3(Al4Mg2)(Si6O18)(BO3)3(OH)3
Tourmaline group O
Trigonal: R3m; structure determined
a = 16.036(1), c = 7.319(1) Å
6.487(60), 5.033(20), 4.642(20), 4.262(30), 4.010(50), 3.545(30), 3.013(35), 2.598(100)

IMA No. 2009-089
Crabtree Emerald mine, Mitchell County, North Carolina, USA
Frank C. Hawthorne
NaMg3Al6Si6O18(BO3)3(OH)3
Tourmaline group F
Trigonal: R3m; structure determined
a = 15.955(3), c = 7.153(2) Å
6.375(19), 3.998(22), 3.475(100), 2.961(60), 2.583(67), 2.392(14), 2.123(14), 2.043(19)

IMA No. 2009-090
Upper Chegem volcanic structure, Kabardino-Balkaria, North Caucasus, Russia (43°17'N 43°6'E)
Evgeny V.Galuskin
CaSnO3
Perovskite group
Orthorhombic: Pbnm; structure of synthetic analogue known
a = 5.56(3), b = 5.71(3), c = 7.943(3) Å
3.984(52), 3.970(19), 2.855(43), 2.812(100), 2.780(19), 1.992(13), 1.985(13), 1.640(13)

IMA No. 2009-091
Tranomaro area, Fort Dauphini region, Madagascar
Roberta Oberti
KCa2(Mg4Al)Si6Al2O22F2
Amphibole group
Monoclinic: C2/m; structure determined
a = 9.9104(2), b = 17.9739(4), c = 5.3205(1) Å, β = 105.534(2)º
8.413(45), 3.374(31), 3.270(55), 3.133(100), 2.934(29), 2.809(47), 2.698(39), 1.647(29)
APPROVAL WITHDRAWN IN FEBRUARY 2010
IMA No. 2009-079
About 25 km southwest from Monte Metocha, Xixano region, north-eastern Mozambique
Roberta Oberti
KNa2(Mg4Fe3+)Si8O22F
Amphibole group
2
Monoclinic: C2/m; structure determined
a = 9.9591(4), b = 17.9529(6) , c = 5.2867(2) Å, β = 103.340(1)º
8.499(58), 3.394(81), 3.286(43), 3.166(60), 2.746(43), 2.707(100), 2.583(45), 2.537(70)
1.873(40)

Approval has been withdrawn for the above mineral IMA No. 2009-079. The previous Chairman of CNMNC, Dr Ernst Burke, has noted that the same mineral was approved as IMA No. IMA1985-023. At the same time that the mineral was approved, voting on the proposed name was suspended because of an imminent report on the nomenclature of the amphibole group. Subsequently, Hogarth et al. (1987) published definitive data for the mineral without noting that it had been approved by IMA, describing it as "potassium fluor-magnesio-arfvedsonite". As a result of later enquiries, and in light of the currently accepted amphibole nomenclature, Hogarth (2006) published a note in which the mineral approval was reported and named it fluoro-potassic-magnesio-arfvedsonite. This is the correct name for the mineral, renamed with IMA approval.

Hogarth, D.D. (2006) Fluoro-potassic-magnesio-arfvedsonite, KNa2Mg5Si8O22F2
Hogarth, D.D., Chao, G.Y. and Townsend, M.G. (1987) Potassium- and fluorine-rich amphiboles from the Gatineau area, Quebec. Canadian Mineralogist, 25, 739-753. , from the Outaouais region, Quebec, Canada. Canadian Mineralogist, 44, 289.

NOMENCLATURE PROPOSAL APPROVED IN JANUARY 2010

IMA 09-D: The early publication of new mineral names
The Commission has determined to change the way preliminary data for newly approved minerals will be reported. Five additional items on the new minerals will be released every month by the CNMNC as follows:
-  the mineral name (unless the authors explicitly ask to keep it confidential until a full description is published);
 the full authorship;
-  the email contact of the corresponding author;
-  the place of preservation and the catalogue number of the type material;
-  how to cite the new mineral.
It is still a requirement for the authors to publish a full description of the new mineral.
This change will come into effect in March 2010.

IMA 09-E Discreditation of "orthobrochantite" (IMA 1978-064) as the MDO1 polytype of brochantite
Orthobrochantite is discredited. It corresponds to the MDO1 polytype of brochantite.

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