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Mineralogical ClassificationIMA Approvals April 2006

26th Apr 2006 13:00 UTCJim Ferraiolo

PROPOSALS APPROVED IN APRIL 2006 (as posted on IMA-CNMMN website)


IMA No. 2006-001

Tolbachik volcano, Kamchatka Peninsula, Russia

Sergey V. Krivovichev

Cu5O2(SeO3)2Cl2

Dimorphous with georgbokiite

Monoclinic: P21/c; structure determined

a 5.3982 , b 8.0543, c 11.128 Å, β 99.258º

3.22(90), 3.01(100), 2.61(80), 2.270(70), 2.117(60), 1.953(40), 1.482(40), 1.406(40)


IMA No. 2006-002

Mt. Kukisvumchorr, Kola Peninsula, Russia

Sergey V. Krivovichev

K3NaCaY2(Si12O30)·4H2O

New structure type

Orthorhombic: Pcca; structure determined

a 14.972, b 14.137, c 14.594 Ã…

7.00(4), 6.57(6), 5.25(3), 4.20(5), 3.337(10), 3.248(9), 3.101(4), 3.014(8)


IMA No. 2006-003

Kaidun meteorite (South Yemen)

Michael E. Zolensky

FeCrP

Cr-dominant analogue of florenskyite

Orthorhombic: Pnma

a 5.833, b 3.569, c 6.658 Ã…

2.258(46), 2.247(100), 2.139(81), 2.074(31), 1.885(34), 1.866(31), 1.785(43), 1.298(22)


IMA No. 2006-004

Brattnevet Peninsula, Larsemann Hills, Prydz Bay, East Antarctica

Edward S. Grew

(Mg,Fe)3(PO4)2

Mg-dominant analogue of sarcopside

Monoclinic: P21/c; structure determined

a 5.9305, b 4.7583, c 10.2566 Å, β 90.663°

5.92(42), 4.31(29), 3.84(100), 3.48(37), 2.97(25), 2.77(46), 2.51(59), 2.44(40)


IMA No. 2006-005

Hundholmen, Tysfjord, Nordland, north Norway

Gunnar Raade

(Y,REE,Ca,Na)15(Al,Fe3+)CaxAs3+1-x(Si,As5+)Si6B3(O,F)48

Vicanite group

Trigonal: R3m; structure determined

a 10.675, c 27.02 Ã…

4.38(33), 3.114(43), 3.095(29), 2.972(100), 2.947(76), 2.924(66), 2.681(36), 1.978(37)

xAs3+1-x should be in parens, as well.>


IMA No. 2006-006

Augustinovka iron meteorite, Ekaterinoslav (now Dnepropetrovsk), Ukraine

Sergey N. Britvin

Na4Fe7(PO4)6

Fillowite group

Triclinic: P1 or P-1

a 9.643, b 9.633, c 17.645 Å, α 88.26, β 88.16, γ 64.83°

5.12(2), 3.034(10), 2.888(2), 2.715(8), 2.585(3), 2.405(2), 1.870(2), 1.769(2)

26th Apr 2006 14:12 UTCPeter Haas

All added.

27th Apr 2006 11:53 UTCMarco E. Ciriotti Manager

IMA 2006-003 was previously briefly announced in Lunar and Planetary Science.


Reference:

• Mikouchi, T., Zolensky, M., Tachikawa, O., Komatsu, M., Ivanova, M.A., Le, L., Gounelle, M. (2006): Electron back-scattered diffraction (EBSD) analysis of two unusual minerals in carbonaceous chondrites. Lunar and Planetary Science, 37, 1855.
 
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