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Ungaretti, Luciano

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Journal Article
Published: 01 January 2003
European Journal of Mineralogy (2003) 15 (1): 167–176.
...Christian CHOPIN; Bruno GOFFE; Luciano UNGARETTI; Roberta OBERTI Abstract Magnesiostaurolite, ideally A □ 4 B Mg 4 C Al 16 D (Al 2 □ 2 ) T Si 8 O 40 X [(OH) 2 O 6 ], occurs together with talc, clinochlore and kyanite (or alone, armouring corundum) as inclusions in pyrope megablasts from the ultra...
FIGURES
Journal Article
Published: 01 November 2001
European Journal of Mineralogy (2001) 13 (6): 1243–1244.
... . Callegari , A. , Caucia , F. , Mazzi , F. , Oberti , R. , Ottolini , L. , Ungaretti , L. ( 2000 ): The crystal structure of peprossiite(Ce), an anhydrous REE and Al mica-like borate with square pyramidal coordination for Al . Am. Mineral ., 85 , 586 – 593 . Luciano...
FIGURES
Journal Article
Published: 01 December 1973
American Mineralogist (1973) 58 (11-12): 1034–1043.
...Alberto Dal Negro; Isik Kumbasar; Ungaretti Luciano Abstract Teruggite has the chemical formula, 4CaO·MgO·6B 2 O 3 ·As 2 O 5 ·20H 2 O. The cell constants are: a = 15.675(13), b = 19.920(14), c = 6.255(4)Å, β = 99° 20´(5´); V = 1927Å 3 , space group P2 1 /a, density(calc) = 2.192, density(obs...
Journal Article
Published: 01 August 2002
American Mineralogist (2002) 87 (8-9): 1139–1143.
...Paolo Ballirano; Athos Callegari; Franca Caucia; Adriana Maras; Fiorenzo Mazzi; Luciano Ungaretti Abstract The crystal structure of holotype vicanite-(Ce) has been solved and refined to R = 1.8% for 1398 observed reflections with the aid of a new crystal from the same locality (Tre Croci, Vetralla...
FIGURES
Journal Article
Published: 01 September 2001
European Journal of Mineralogy (2001) 13 (5): 871–881.
...Massimo BOIOCCHI; Franca CAUCIA; Marcello MERLI; Danilo PRELLA; Luciano UNGARETTI Abstract We have analyzed the implications of [Mg] VI =>[Fe 2+ ] VI isomorphous substitution in the periclase structure (B1) which forms, under lithospheric P, T conditions, only very limited solid solutions...
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Journal Article
Published: 01 January 2001
American Mineralogist (2001) 86 (1-2): 55–65.
...Marcello Merli; Roberta Oberti; Franca Caucia; Luciano Ungaretti Abstract Leverage analysis enables identification of reflections with the greatest influence on the estimate of each refined variable, and thus may be an important tool to improve standard structure-refinement procedures, especially...
FIGURES | View All (6)
Journal Article
Published: 01 March 2000
American Mineralogist (2000) 85 (3-4): 532–542.
...Marcello Merli; Luciano Ungaretti; Roberta Oberti Abstract Leverage analysis allows detection of the reflections that have the greatest influence on the estimate of a refined variable. We have applied leverage analysis in the structure refinement of some rock-forming minerals, in the attempt...
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Journal Article
Published: 01 March 2000
American Mineralogist (2000) 85 (3-4): 586–592.
...Athos Callegari; Franca Caucia; Fiorenzo Mazzi; Roberta Oberti; Luisa Ottolini; Luciano Ungaretti Abstract Single-crystal structure refinements are presented of the holotype of crystal peprossiite-(Ce) (Monte Cavalluccio) and of a new sample from Cura di Vetralla (Viterbo, Italy) with slightly...
FIGURES
Journal Article
Published: 01 October 1997
American Mineralogist (1997) 82 (9-10): 1019–1037.
.... Schumacher; David C. Smith; Nick C. N. Stephenson; Luciano Ungaretti; Eric J. W. Whittaker; Guo Youzhi Abstract The International Mineralogical Association’s approved amphibole nomenclature has been revised to simplify it, make it more consistent with divisions generally at 50%, define prefixes and modifiers...
Journal Article
Published: 01 February 1997
The Canadian Mineralogist (1997) 35 (1): 219–246.
.... Schumacher; David C. Smith; Nick C. N. Stephenson; Luciano Ungaretti; Eric J. W. Whittaker; Guo Youzhi © 1997 Mineralogical Association of Canada 1997 ...
Journal Article
Published: 01 August 1996
American Mineralogist (1996) 81 (7-8): 995–1002.
...Frank C. Hawthorne; Roberta Oberti; Luciano Ungaretti; Joel D. Grice Abstract Electron microprobe analysis of amphiboles from Pargas, Finland, shows up to 2.42 Ca apfu (atoms per formula unit), far in excess of the usual maximum value of 2.00 Ca apfu observed in amphiboles. The most Ca-rich...
Journal Article
Published: 01 February 1996
American Mineralogist (1996) 81 (1-2): 226–228.
...Frank C. Hawthorne; Roberta Oberti; Luciano Ungaretti; Luisa Ottolini; Joel D. Grice; Gerald K. Czamanske Abstract Fluor-ferro-leakeite is a new amphibole species from the Canada Pinabete pluton, Questa, New Mexico, U.S.A.; it occurs in association with quartz, alkali feldspar, acmite, ilmenite...
Journal Article
Published: 01 December 1995
European Journal of Mineralogy (1995) 7 (6): 1239–1249.
...Marcello Merli; Athos Callegari; Elio Cannillo; Franca Caucia; Marco Leona; Roberta Oberti; Luciano Ungaretti GeoRef, Copyright 2004, American Geological Institute. 1995 ...
Journal Article
Published: 01 December 1995
European Journal of Mineralogy (1995) 7 (6): 1299–1312.
...Luciano Ungaretti; Marco Leona; Marcello Merli; Roberta Oberti GeoRef, Copyright 2004, American Geological Institute. 1995 ...
Journal Article
Published: 01 October 1995
European Journal of Mineralogy (1995) 7 (5): 1049–1063.
...Roberta Oberti; Luciano Ungaretti; Elio Cannillo; Frank C. Hawthorne; Isabella Memmi GeoRef, Copyright 2004, American Geological Institute. 1995 ...
Journal Article
Published: 01 August 1995
The Canadian Mineralogist (1995) 33 (4): 867–878.
...Roberta Oberti; Frank C. Hawthorne; Luciano Ungaretti; Elio Cannillo © 1995 Mineralogical Association of Canada 1995 Mineralogical Association of Canada ...
Journal Article
Published: 01 August 1995
The Canadian Mineralogist (1995) 33 (4): 907–911.
...Frank C. Hawthorne; Luciano Ungaretti; Roberta Oberti © 1995 Mineralogical Association of Canada 1995 Mineralogical Association of Canada ...
Journal Article
Published: 01 June 1994
American Mineralogist (1994) 79 (5-6): 443–451.
...Frank C. Hawthorne; Luciano Ungaretti; Roberta Oberti; Elio Cannillo; Eugene A. Smelik Abstract The crystal structures of five monoclinic alkali amphiboles from Kajlidongri, Madhya Pradesh, India, have been refined to R indices of <2% using ~1100 observed (5 σ ) reflections measured with Mo Kα X...
Journal Article
Published: 01 December 1993
American Mineralogist (1993) 78 (11-12): 1290–1298.
...Roberta Oberti; Luciano Ungaretti; Ali Tlili; David C. Smith; Jean-Louis Robert Abstract The structure of preiswerkite, ideally Na(Mg 2 Al)(Si 2 Al 2 )O 10 (OH) 2 , from the type locality at Geisspfad in Switzerland, has been determined by single-crystal X-ray diffraction and refinement...
Journal Article
Published: 01 August 1993
American Mineralogist (1993) 78 (7-8): 733–745.
...Frank C. Hawthorne; Luciano Ungaretti; Roberta Oberti; Piero Bottazzi; Gerald K. Czamanske Abstract The crystal structures of 13 alkali amphiboles have been refined to R values of 1–2% using single-crystal Mo Kα X-ray data. Crystals used in the collection of the intensity data were subsequently...