New IMA approved minerals and nomenclature changes

PROPOSALS APPROVED IN SEPTEMBER 2009

IMA No. 2009-022
Su Senargiu, Sarroch, Sardinia, Italy
Paolo Orlandi
BiMo_2+xO₇(OH)·H₂O
New structure type
Monoclinic: P2₁/n; structure determined
a 5.855(1), b 9.048(1), c 13.920(3) Å, ß 100.44(3)º
4.83(100), 3.41(21), 3.30(25), 3.015(50), 2.755(60), 2.080(50), 1.688(20), 1.509(30)

IMA No. 2009-040
Köves Hill (46.16°N 18.32°E), Pécs-Vasas, Mecsek Mountains, Hungary
Sándor Szakáll
(NH₄)₂Mg₅Fe³⁺₃Al(SO₄)₁₂·18H₂O
NH ₄⁺-Mg²⁺ analogue of voltaite
Cubic: Fd3c
a 27.351(3) Å
6.85(24), 5.59(100), 3.562(66), 3.420(72), 3.059(22), 2.197(22), 1.784(25), 1.558(25)

IMA No. 2009-041
Aris phonolite, Windhoek District, Auas Mountains, Namibia
Victor N. Yakovenchuk
Na₅Ca₆Si₁₈O₃₈(OH)₁₃·6H₂O
New structure type
Triclinic: P-1

a 9.55(3), b 9.395(8), c 16.329(3) Å, a 100.2(1), ß 94.9(2), . 117.8(2)º
15.50(100), 4.98(14), 4.89(14), 4.22(16), 3.159(30), 3.022(33), 2.792(24), 1.823(30)

IMA No. 2009-042
La Vendida Mine, Sierra Gorda, Antofagasta Region, Chile
Jochen Schlueter
Cu₂Cl(OH)₃
Polymorph of atacamite
Triclinic: P-1; structure determined

a 9.1646(9), b 9.2029(8), c 9.2102(8) Å, a 95.858(6), ß 96.290(7), . 96.507(2)º
5.432(100), 4.657(10), 2.889(39), 2.747(94), 2.257(56), 1.895(7), 1.812(21), 1.702(29)


IMA No. 2009-043
Poudrette Quarry, Rouville County, Mont Saint-Hilaire, Quebec, Canada
Andrew M. McDonald
(Na,K)₂CaTi₂Si₁₀O₂₆·8H₂O
Related to natrolemoynite, altisite and lemoynite
Monoclinic: C2/m; structure determined
a 10.1839(5), b 15.8244(6), c 9.1327(7) Å, ß 104.463 (2)º
8.835(85), 7.913(100), 6.849(70), 5.526(40), 4.336(45), 3.514(80), 3.426(55), 2.792(50)

IMA No. 2009-044
Bird Nest drift, Otto Mountain, San Bernardino County, California, USA (35°16.6'N, 116°6.0'W)
Anthony R. Kampf
Pb₃TeO₄Cl₂
Isostructural with perite and nadorite
Orthorhombic: Bmmb; structure determined
a 5.5649(6), b 5.5565(6), c 12.475(1) Å
3.750(58), 2.857(100), 2.781(43), 2.075(31), 1.966(30), 1.665(21), 1.620(52), 1.250(17)

IMA No. 2009-045
Aga mine (35°16.4'N, 116°5.7'W and the Bird Nest drift (35°16.6'N, 116°6.0'W), Otto Mountain, San Bernardino County, California, USA
Anthony R. Kampf
Pb₂(UO₂)TeO₆
Known structure type
Monoclinic: P2₁/c; structure determined
a 5.7217(16), b 7.7478(2), c 7.889(2) Å, ß 90.833(5)º
3.501(29), 3.234(100), 2.985(37), 2.861(40), 2.768(30), 2.220(23), 1.990(21), 1.713(22)

IMA No. 2009-046
Cleveland tin mine, Luina, Waratah, Tasmania, Australia (41°28'57"S, 145°23'7"E; type locality); Mount Bendoc, Victoria, Australia (37°7'60"S, 148°54'0"E); Mount Bischoff, Tasmania, Australia (41°25'S, 145°31'E); Blue Mountain Saddle (Bald Hornet Claim), North Bend, King County, Washington, USA (47°31'N, 121°43'W)
Stuart J. Mills
(Na,[])(Fe^2+,Mg)₃Al₆(BO₃)₃Si₆O₁₈(OH)₄
Tourmaline group
Monoclinic: Cm; structure determined
a 10.408(3), b 15.991(5), c 7.189(2) Å, ß 117.44(2)º
6.47(55), 4.26(52), 4.01(79), 3.51(49), 2.98(48), 2.59(100), 2.06(41), 2.05(44)

IMA No. 2009-047
Tom’s phosphate quarry, Kapunda, South Australia, Australia (34º21'S 138º55'E)
Stuart J. Mills
CaNaFe₄(PO₄)₄(OH)₃·5H₂O
New structure type
Triclinic: P-1

a 7.725(4), b 6.333(2), c 9.786(5) Å, a 99.10(3), ß 105.50(2), . 89.86(3)º
9.338(100), 7.442(37), 5.173(52), 3.828(45), 3.123(34), 2.817(33), 2.753(64), 2.417(48)

IMA No. 2009-048
Block 14 open cut, Broken Hill, New South Wales, Australia
Peter Elliott
Cu₃Cd₂(SO₄)₂(OH)₆·4H₂O
Structurally related to Cu and Zn sulphate minerals containing sheets of edge-sharing (Cu²⁺,Zn) octahedra
Monoclinic: P2₁/c; structure determined
a 10.863(2), b 13.129(3), c 11.169(2) Å, ß 113.04(3)º
9.991(90), 5.001(90), 4.591(45), 3.332(60), 2.824(40), 2.769(55), 2.670(47)

IMA No. 2009-049
La Fossa crater, Vulcano, Aeolian Islands, Italy
Italo Campostrini
BiSI
I-dominant analogue of demicheleite-(Br) and demicheleite-(Cl)
Orthorhombic: Pnam
a 8.4501(7), b 10.1470(9), c 4.1389(4) Å
6.490(100), 4.346(94), 3.896(90), 3.243(22), 2.999(22), 2.709(60), 2.466(21), 2.161(38)

NOMENCLATURE PROPOSALS APPROVED TO SEPTEMBER 2009

IMA 07-D ALUNITE SUPERGROUP
The recommended nomenclature of the alunite supergroup is accepted. Minamiite is renamed natroalunite-2R, and beaverite is renamed beaverite-(Cu). Orpheite is discredited because it is identical to P-rich hinsdalite.

IMA 08-D SLAVIKITE
The proposed revision of chemical composition and crystal structure of slavikite is accepted. The formula of slavikite now becomes (H₃O⁺)₃Mg₆Fe₁₅(SO₄)₂₁(OH)₁₈·98H₂O.

OLDER NOMENCLATURE MODIFICATIONS APPROVED TO SEPTEMBER 2009

IMA 07-E HASTITE [already published (jf)]
The mineral hastite, orthorhombic CoSe₂ (marcasite group), is discredited. The type material has been shown to be ferroselite, FeSe₂.

IMA 08-B ß-DOMEYKITE
Proposal IMA 68-3 is nullified. The name “wrightite” is discredited and the original name ß-domeykite is revalidated.

IMA 08-C KHINITE and PARAKHINITE [already published](jf) Khinite and parakhinite are polytypic. As a consequence, khinite is renamed khinite-4O, and parakhinite is renamed khinite-3T .



Edited 1 time(s). Last edit at 10/06/2009 01:58PM by Jim Ferraiolo.

Jim, Does this mean that minamiite is now a polytype of natroalunite?

The structure of IMA No. 2009-042 has already been reported in
Malcherek, T. and Schlüter, J. (2009): Structures of the pseudo-trigonal polymorphs of Cu2(OH)3Cl. Acta Crystallogr. B65, 334-341.

Alfredo,
My guess is yes, only because the way it is written is as a polytype.

Minamiite is only different from natroalunite in O-D relationships. Jambor's original 1999 nomenclature paper wanted to change minamiite to natroalunite-2cR, still keeping it as a species, with the 2c indicating a supercell [minamiite's c=2c of natroalunite] and the R to indicate rhombohedral.

As usual, I prefer waiting to see the final paper before making any gross changes. The fact that beaverite is to be changed to Beaverite-(Cu), indicates other name changes. Osarizawaite is the Al-analog of beaverite, and I think beaverite has priority so...., there's another possibility.



Edited 1 time(s). Last edit at 10/06/2009 03:32PM by Jim Ferraiolo.

IMA No. 2009-046
Cleveland tin mine, Luina, Waratah, Tasmania, Australia (41°28'57"S, 145°23'7"E; type locality); Mount Bendoc, Victoria, Australia (37°7'60"S, 148°54'0"E); Mount Bischoff, Tasmania, Australia (41°25'S, 145°31'E); Blue Mountain Saddle (Bald Hornet Claim), North Bend, King County, Washington, USA (47°31'N, 121°43'W)
Stuart J. Mills
(Na,[])(Fe2+,Mg)3Al6(BO3)3Si6O18(OH)4
Tourmaline group
Monoclinic: Cm; structure determined
a 10.408(3), b 15.991(5), c 7.189(2) Å, ß 117.44(2)º
6.47(55), 4.26(52), 4.01(79), 3.51(49), 2.98(48), 2.59(100), 2.06(41), 2.05(44)


Cleaveland is the type locality; the others are confirmed occurrences.

So 2009-046 is presumably a dimorph of schorl? Presumably the definition of the tourmaline group will no longer include the word "trigonal".
I wonder how many of the numerous "schorl"-bearing hydrothermal tin veins in Bolivia are really 2009-046?

It's composition falls between schorl and dravite. It is likely to be very common. We haven't tried very hard to get this many localities.

We work also on a F-analogue of IMA No. 2009-046.

I have moved photos of 46 and 47 which were under schorl/dravite and meurigite respectively.

Stu - is it likely that there are all three at Luina and Bischoff (ie: schorl, dravite and the new one) or do they grade into one another, or is there only the one?

Regards
Steve

Jim Ferraiolo Wrote:
-------------------------------------------------------
The fact that beaverite is to be changed to Beaverite-(Cu), indicates other name changes. Osarizawaite is the Al-analog of beaverite, and I think beaverite has priority so...., there's another possibility.

I hope not. Too much history can be lost with this type of change. And we are nowhere near consistent in its application!

Regards
Steve

Hi Steve,
I agree. We'll just have to see what was changed. Then we can vent about it.

You would think the IMA would think twice about such renamings after the bad feeling caused by hancockite and the great apatite shuffle.

Jolyon

Hi Stu
Re 2009-046 - interesting. From probe analyses I determined that there were several tourmalines at Bischoff (sometimes in a single crystal), compositionally schorl, dravite, olenite and foitite at least - are they all likely to be monoclinic or only certain restricted compositions? And is there likely to be any exsolution/intermixing of the different structures? Will careful PXRD show the structural difference or is single crystal work required?

Regards,
Ralph

Ralph: single-crystal work with a modern high-resolution diffractometer is definitely necessary from our experience. Optics have not been determined on all samples, so we don't know exactly the 2V value (ranges).


Related cationic ordering is also known from Li-tourmalines:

Akizuki, M., Kuribayashi, T., Nagase, T., and Kitakaze, A. (2001) Triclinic liddicoatite and elbaite in growth sectors of tourmaline from Madagascar. American Mineralogist, 86, 364-369.

Shtukenberg, A., Rozhdestvenskaya, I., Frank-Kamenetskaya, O., Bronzova, J., Euler, H., Kirfel, A., Bannova, I. & Zolotarev, A. (2007): Symmetry and crystal structure of biaxial elbaite-liddicoatite tourmaline from the Transbaikalia region, Russia. American Mineralogist, 92, 675-686.

Ralph,

I haven't looked at other tourmalines in the Tassy occurrences so all three might occur, but any of the hairy ones will be the new mineral. Without a complete single crystal and probe its probably difficult to tell. All compositions of the new one are intermediate between schorl and dravite. End-member compositions are like to still be the normal tourmalines.

So is the new tourmaline intermediate by definition, ie. not strictly divided by Fe- or Mg-dominance?
Sort of like the situation with bixbyite or pentlandite?

The sites are ordered in the monoclinic.

The way the formula is written above implies Fe-dominance.

It is but were not writing the crystallographic formula including every site.