 | Oberti, Roberta, Ventura, Giancarlo Della, Ottolini, Luisa, Hawthorne, Frank C., Bonazzi, Paola (2002) Re-definition, nomenclature and crystal-chemistry of the hellandite group. American Mineralogist, 87 (5) 745-752 doi:10.2138/am-2002-5-618 | Journal (article/letter/editorial) | | Re-definition, nomenclature and crystal-chemistry of the hellandite group ROBERTA OBERTI,1,* GIANCARLO DELLA VENTURA...University of Manitoba, Winnipeg, Manitoba R3T 2N2, Canada 4 Dipartimento di Scienze della Terra, Università...analyses of a series of non-metamict samples of hellandite recently found in Latium (Italy), together with...data on hellandite, allow a better understanding of the crystal-chemistry of the hellandite group. Relative...structure determined by Mellini and Merlino (1977) for a Y-rich sample from Predazzo (Italy), a new tetrahedrally |  | | Journal (article/letter/editorial) | | non-metamict Th-rich hellandite-(Ce) from Latium (Italy) and crystal chemistry of the hellandite-group minerals...ABSTRACT The crystal structure of a Th-U-rich, Y-poor hellandite-(Ce) occurring in a volcanic ejectum from...5% for 2226 observed reflections [I > 3 σ(I)]. Hellandite from Capranica is monoclinic P2/a with a = 19...tetrahedral cavity, usually occupied by H in hellandite, is partially (35–40%) occupied by Be and/or...the case, the [B 4Si4O22] tetrahedral chains of hellandite are locally cross-linked to form a sheet, which |  | | Book | | Mineralogical Association of Canada Association minéraiogique du Canada 1 Credits for photographs...1000° Mots inc. Native Gold on Quartz, Paymaster mine, South Porcupine, Ontario / Photo by Brian Boyle...Courtesy of the Royal Ontario Museum, Toronto, Canada Hilaire, Quebec / Photo by Claire Dufour Printing...Marquis imprimeur inc. Barite on Quartz, Rock Candy mine, Grand Forks, British Columbia / Photo by Ken Mayer...Society Girl mine, Moyie, British Columbia / Photo by Ken Mayer Mineralogical Association of Canada P.O. Box |  | | Book (edition) | | Linopolis, Brazil, H Page 13: Gold, 35 mm.Eagle's est Mine, California, G Publi!>hed by Grdllit.u.o. Stefanikova43...Strunz since 1941 (Strunz and Nickel 2001): • Subsidim-y anions (OH,F,O) are positioned before the complex...USA, UK, and the provinces Ontario and Quebec in Canada, generally well known to readers. However, the...is now divided to three regions: INTRODUCTION Nord-Kivu, Sud-Kivu, and Maniema. There is also a country...ardennite, Triclinic. ah,c = 8. 4+, 11.12. 7.28, o.,~,y = 90°53', hollandite. and shattuckite, etc., in brownish |  | | Book | | Australia Nelson Canada 1120 Birchmount Road Scarborough, Ontario MIK 5G4, Canada 16 15 14 13 12 11...T1 Th Sn Ti TiOx WO4 WO3 W WOx u UOx UO2 V VOx Yb Y Zn Zr No. 162 109 17 12 15 1337 91 422 429 424 50...K(U02)As04*3H20, Tet. Vitreous yellow. Fuemrole mine, Temple Mt., Emery Co., Utah, USA. H= 2-3, Djjj=...grey, bluish-grey, yellow, light green. Langban mine, Filipstad (near), Varmland, Sweden. H= 5, Djjj=3...5As30ig, E Rhom. Translucent blue-green. Terres mine, St. Ausdell, Cornwall, England and/or Johanngeorgenstadt |  | Gaines, Richard V., Skinner, H. Catherine W., Foord, Eugene E., Mason, Brian, Rosenzweig, Abraham, King, Vandall T. (1997) Dana's New Mineralogy (8th ed.) Wiley-Interscience. p.1872 | Book (edition) | | All rights reserved. Published simultaneously in Canada. Reproduction or translation or any part of this...Ercit: Canadian Museum of Nature, Ottawa, Ontario, Canada. Richard C. Erd: U.S.G.S., Menlo Park, California...example, tritomite-(Ce) and tritomite-(Y) are end members [Ce+Y] in the tritomite series [AM 51:152(1966)]...nal order detectable by diffract at least a implies y generall here use fied exhibits external faces, but...where h, k and] are positive or negative, unequal y elesymmetr all by upon acted are faces al the general |
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