Quick Search:    advanced search

GSW Home   GeoRef Home   My GSW Alerts   Contact GSW   About GSW   Journals List   Help

This Article Abstract Full Text Full Text (PDF) Supplementary Data Info Alert me when this article is cited Alert me if a correction is posted Citation Map Services Email this article to a friend Similar articles in this journal Similar articles in ISI Web of Science Alert me to new issues of the journal Download to citation manager Google Scholar Articles by Britvin, S. N. Articles by Aksenova, G. Y. GeoRef GeoRef Citation

Rudashevskyite, the Fe-dominant analogue of sphalerite, a new mineral: Description and crystal structure

¹ Department of Crystallography, St. Petersburg State University, Universitetskaya Nab. 7/9, 199034 St. Petersburg, Russia
² Geological Institute, Kola Science Center, Russian Academy of Sciences, Fersman Str. 21, 184200 Apatity, Russia
³ Department of Mineral Deposits, St. Petersburg State University, Universitetskaya Nab. 7/9, 199034 St. Petersburg, Russia
⁴ Mekhanobr-Engeneering Join-Stock Company, Vasilievsky ostrov, 21 line 2, 199026 St. Petersburg, Russia

View larger version (48K): [in this window] [in a new window]   FIGURE 1. Xenomorphic grain of rudashevskyite (Rud) attached to large schreibersite grain (Schr), associated with troilite (Tr), idiomorphic roedderite tablets (Roed), and clinoenstatite (Px). Note abundant micro-patches of troilite along rudashevskyite rim. Reflected light.

View larger version (59K): [in this window] [in a new window]   FIGURE 2. Foliated lamellar aggregate of rudashevskyite (Rud) with inclusions of troilite (Tr), associated with roedderite (Roed) and clinoenstatite (Px). Brighter lamellae are slightly enriched in Zn (~0.03 Zn apfu). Numbers correspond to analyses listed in Table 2. BSE image.

View larger version (36K): [in this window] [in a new window]   FIGURE 3. (a) Detail of Figure 2 showing relative brightness of troilite (Tr) lamellae in BSE compared with rudashevskyite (dark and light lamellae). Note that troilite looks brighter than rudashevskyite. (b) Exsolution lamellae of troilite (light) in sphalerite, (Zn0.60Fe0.35Mn0.06) = 1.01S0.99 (dark matrix), meteorite Sardis (IAB). BSE image. Note that both rudashevskyite and sphalerite look darker than troilite despite greater mean atomic number.

View larger version (10K): [in this window] [in a new window]   FIGURE 4. Reflectance spectrum of rudashevskyite measured in air, curve (1), in comparison with spectra of reference sphalerites: (2) 45 mol% FeS (Chvileva et al. 1988); (3) Sardis meteorite, (Zn0.60Fe0.35Mn0.06) = 1.01S0.99 (our data); (4) 23 mol% FeS (Criddle and Stanley 1993); (5) ZnS with 0.4 wt% Cd (Criddle and Stanley 1993); outer bottom scale in nanometers. Black circles represent reflectance values measured at 580 nm for above mentioned minerals and for pure sphalerite-type FeS (Murowchick and Barnes 1986); inner bottom scale in atoms per formula unit.

View larger version (41K): [in this window] [in a new window]   FIGURE 5. Reconstruction of reciprocal space of rudashevskyite attributed (first domain) along [001], zero-layer. Note weak reflections to the second domain [220(2)].

View larger version (42K): [in this window] [in a new window]   FIGURE 6. Reconstruction of reciprocal space of rudashevskyite (first domain) along [110], zero-layer. Note weak and smeared reflections attributed to the adjacent rudashevskyite domains, and sharp (110) reflections of embedded kamacite crystal (110 Kamacite).

View larger version (10K): [in this window] [in a new window]   FIGURE 7. Schematic projections of the three rudashevskyite domains (displayed as tetrahedra) onto cube plane of embedded kamacite crystal.

View larger version (17K): [in this window] [in a new window]   FIGURE 8. Chemical composition of natural Fe-dominant members of FeS-ZnS-MnS system. Scale in apfu (2 apfu total). References: [1] El Goresy (1967); [2] Buseck and Holdsworth (1972); [3] Weinke et al. (1977); [4] Rambaldi et al. (1986); [5] Peter and Scott (1988); [6] El Goresy and Ehlers (1989); [7] Ikeda (1989); [8] Kissin (1989); [9] Yaroshevsky et al. (1989); [10] Lin et al. (1991); [11] Zhang and Sears (1996); [12] Lin and Kimura (1997); [13] Petrichenko and Ulyanov (1998); [14] Lin and El Goresy (2002); [15] Glasby and Notsu (2003); [16] Mitchell and Belton (2004).