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American Mineralogist; May 2004; v. 89; no. 5-6; p. 894-897
© 2004 Mineralogical Society of America
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New Mineral Names*

John L. Jambor1,{dagger} and Andrew C. Roberts2

1 Department of Earth and Ocean Sciences, University of British Columbia, Vancouver, British Columbia V6T 1Z4, Canada
2 Geological Survey of Canada, 601 Booth Street, Ottawa K1A 0E8, Canada

Correspondence: {dagger} E-mail: JLJambor@aol.com

The first 20% of the full text of this article appears below.

ALSAKHAROVITE-ZN*

I.V. Pekov, N.V. Chukhanov, A.E. Zadov, K.A. Rozenberg, R.K. Rastsvetaeva (2003) Alsakharovite-Zn, NaSrKZn(Ti,Nb)4[Si4O12]2(O,OH)4•7H2O, a new mineral of the labuntsovite group from the Lovozero massif, Kola Peninsula. Zapiski Vseross. Mineral. Obshch., 132(1), 52 58 (in Russian, English abs.).

K.A. Rozenberg, R.K. Rastsvetaeva, I.V. Pekov, N.V. Chukhanov (2002) New zinc-rich representative of the labuntsovite group: Crystal structure and microtwinning. Doklady Chemistry, 383(4–6), 110–113.

Electron microprobe analysis gave Na2O 2.04, K2O 2.43, CaO 1.48, SrO 4.49, BaO 3.65, MgO 0.04, MnO 0.11, FeO 0.22, ZnO 5.02, Al2O3 0.15, SiO2 39.33, TiO2 18.89, Nb2O5 12.57, H2O (TGA) 11.1, sum 101.42 wt%, corresponding to (Na0.68Ca0.32){sum}1.00(Sr0.53Na0.12){sum}0.65(K0.63Ba0.29){sum}0.92(Zn0.75Fe0.04Mn0.02 Mg0.01){sum}0.82(Ti2.88 Nb1.15){sum}4.03(Si7.96Al0.04){sum}8O24[O2.58(OH)1.42]{sum}4•6.80H2O, simplified as in the title. Occurs as white, pale brown, or colorless crystals up to 0.5 x 2 x 8 mm, elongate [010], vitreous luster, transparent to translucent, brittle, white streak, no cleavage, uneven fracture, H = 5, Dmeas = 2.90, Dcalc = 2.93 g/cm3 for Z = 2, microtwinned on (001) and (01). Optically biaxial positive, {alpha} = 1.680(1), ß = 1.687(2), {gamma} = 1.787(5), 2Vmeas = 25(10), 2Vcalc = 31°, nonpleochroic, no dispersion observed, orientation Y = b. Single-crystal X-ray structure study (R = 0.058) indicated monoclinic symmetry, space group Cm, a = 14.495(10), b = 13.945(10), c = 7.838(8) Å, ß = 117.75(7)°, gutkovaite structural type. Strongest lines of the X-ray powder pattern (57 mm camera, FeK{alpha} radiation) are 6.96(100,020,001), 3.21(80,42,400), 3.11(90,041,022,240), 2.50(40, 44,40), and 1.70(40,46,44,461,442).

The mineral occurs in cavities in eudialyte-aegirine-feldspar pegmatite at Mt. Lepkhe-Nelm, Lovozero alkaline massif, Kola Peninsula, Russia. Among the associated minerals are lamprophyllite, natrolite, halloysite, . . . [Full Text of this Article]






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