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Praborna Italy

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Journal Article
Published: 01 February 2000
The Canadian Mineralogist (2000) 38 (1): 101–117.
...Elena-Adriana Perseil; Philippe Blanc; Daniel Ohnenstetter Abstract We describe important variations in the crystal chemistry of fluorapatite from the manganiferous deposit at the St. Marcel – Praborna mine in the Val d’Aosta, Italy. Three types of fluorapatite were observed...
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Journal Article
Published: 01 June 1999
The Canadian Mineralogist (1999) 37 (3): 673–678.
Journal Article
Published: 01 October 1997
Mineralogical Magazine (1997) 61 (5): 655–669.
...David C. Smith; Elena-Adriana Perseil Abstract The petrographical, crystal-chemical and petrogenetical aspects of rutile rich in antimony (up to 33.75 wt.% Sb 2 O 5 ; equal to 0.2 Sb (super +) per O = 2) from St. Marcel-Praborna in the Aosta Valley, Italy, were re-examined. These compositions occur...
Journal Article
Published: 01 August 1996
European Journal of Mineralogy (1996) 8 (4): 655–665.
Journal Article
Published: 01 December 1995
Mineralogical Magazine (1995) 59 (4): 717–734.
Journal Article
Published: 01 September 2006
European Journal of Mineralogy (2006) 18 (5): 569–582.
...+ in the M1 site; it occurs at the Praborna manganese mine, Saint-Marcel, Aosta valley, Italy, in a Mesozoic eclogite-facies ophiolitic unit of the western Alps. Associated minerals are rhodochrosite and Mn-pyroxenoid, with minor calderite, spessartine, hematite and pyrophanite. The structural formula is A1...
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Journal Article
Published: 01 August 2010
European Journal of Mineralogy (2010) 22 (4): 577–594.
... ). However, a discussion arose on the origin and evolution of the few Mn ores associated with meta-ophiolites and strongly metamorphosed at high-pressure conditions, such as those of Praborna (Italy; this study) and Andros (Greece; e.g ., Reinecke, 1985 ). Their actual origin, hydrogenous ( i.e...
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Journal Article
Published: 01 March 2003
European Journal of Mineralogy (2003) 15 (2): 427–433.
... from St. Marcel-Praborna, Italy, Smith & Perseil (1997) recognised that Sb is present entirely as Sb 5+ , and substitutes for Ti 4+ by the following cation exchange mechanism: 2 VI M 4+ ↔ VI M 3+ + VI M 5+ , where VI M 3+ = (Al, Cr, Mn, Fe) 3+ . The rutile of this occurrence...
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Journal Article
Published: 27 January 2015
The Canadian Mineralogist (2014) 52 (5): 799–808.
... been reported by Zhu et al. ( 2009 ) and Perseil et al. ( 2000 ). In particular, Perseil et al. ( 2000 ) described As-bearing fluorapatites in the manganiferous deposit of St Marcel-Praborna (Italy) and related their formation to the late circulation of fluids enriched in As and Sr...
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Journal Article
Published: 01 August 2020
American Mineralogist (2020) 105 (8): 1242–1253.
... the procedure outlined in Tumiati et al. (2015) . V 5+ is assumed to occur in wakefieldite and V 3+ in the other minerals. The Praborna manganese ore (Saint-Marcel valley, Italy; Fig. 1 ), hosted in metaophiolites belonging to the Zermatt-Saas unit of the Western Italian Alps, has been interpreted...
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Journal Article
Published: 01 March 2014
European Journal of Mineralogy (2014) 26 (1): 171–178.
... ) and strontiomelane from Praborna, Italy ( Meisser et al. , 1999 ). In the priderite group, Szymański (1986) solved the 5.8 Å structure of mannardite. The crystal structure determination suggests that the lower-charge cations (Fe 3+ , Mn 3+ ) are preferentially hosted in Mn1 and Mn2 sites...
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Journal Article
Published: 01 February 2006
The Canadian Mineralogist (2006) 44 (1): 229–248.
... . Martin-Vernizzi , S. ( 1984 ): La mine de Praborna (Val d’Aoste, Italie): une série manganésifère métamorphisée dans le faciès éclogite . Thèse de doctorat, Université Pierre et Marie Curie , Paris, France .[REVIEW] McLennan , S.M. ( 1989 ): Rare earth elements in sedimentary...
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Journal Article
Published: 02 January 2004
Reviews in Mineralogy and Geochemistry (2004) 56 (1): 495–552.
...) that also contain manganoan biotite, sericite, chlorite, orthoclase, microcline, albite, spessartite-calderite, ferrian braunite, bixbyite, hematite, rutile, apatite, and zircon ( Balan and David 1978 ). At the type locality (Praborna mine, St. Marcel Valley, Piemonte, Italy) piemontite occurs...
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Journal Article
Published: 01 March 2000
American Mineralogist (2000) 85 (3-4): 627–630.
... of the cryptomelane group from St. Marcel–Praborna, Aosta Valley, Italy. Can. Mineral., 37, 673–678. The most Sr-rich of six listed electron microprobe analyses has MnO 2 58.71, Mn 2 O 3 16.51, Fe 2 O 3 6.27, TiO 2 0.70, SiO 2 0.45, K 2 O 0.83, Na 2 O 0.17, BaO 1.39, SrO 12.77, sum 97.80 wt%, corresponding...
Journal Article
Published: 01 October 2012
European Journal of Mineralogy (2013) 25 (1): 85–90.
... analogue of cryptomelane ( Meisser et al. , 1999 ). Its ideal chemical formula is Sr(Mn 4+ 6 Mn 3+ 2 )O 16 . The type locality is the Praborna mine, St. Marcel, Aosta Valley, Italy. No structural information is available; according to the original description, the mineral is monoclinic, space group P 2...
Journal Article
Published: 01 March 2001
American Mineralogist (2001) 86 (3): 205–214.
... as hollandite) with up to 4 wt% SrO have been reported from Mn deposits ( Perseil 1988 ; Cabella et al. 1995 ) and a piemontite quartzose schist (metachert) ( Banno 1996 ). Strontiomelane, a Sr-analogue of hollandite, was recently reported from the Praborna Mn deposit, Italy ( Meisser et al. 1999...
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Journal Article
Published: 01 April 2007
American Mineralogist (2007) 92 (4): 703–707.
... Paris [reference no. 73951 ENSMP, manganiandrosite-(Ce), IMA CNMMN no. 2002–49, and 73952 ENSMP, vanadoandrosite-(Ce), IMA CNMMN no. 2004–15]. P.C.P. Manganiandrosite-(Ce) was discovered in the Praborna Mn deposit, Saint-Marcel, Val d’Aosta, Italy, which belongs to the eclogitic facies...
Journal Article
Journal: Economic Geology
Published: 01 August 2000
Economic Geology (2000) 95 (5): 1173–1176.
... Cerite-(Ce) and thorian synchysite-(Ce) from the Niederbobritzsch granite, Erzgebirge, Germany: Implications for the differential mobility of the LREE and Th during alteration— H.-J. Förster 67 As-bearing fluorapatite in manganiferous deposits from St. Marcel–Praborna, Val d’Aosta, Italy— E...
Journal Article
Published: 01 October 2000
The Canadian Mineralogist (2000) 38 (5): 1075–1101.
..., in radiolarite-hosted deposits at Falotta in the Oberhalbstein, Switzerland ( Geiger 1948 ), at Praborna in the Aosta Valley, Italy ( Martin-Vernizzi 1984 , Perseil 1991 ), and in the Ligurian Alps, Italy ( Cortesogno et al. 1979 ), in other chert-hosted deposits in the Hautes-Pyrénées in France ( Ragu...
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Journal Article
Published: 13 May 2022
Mineralogical Magazine (2022) 86 (3): 459–477.
... euhedral microcrystals in the kaolinised albitite indicates that the Sb introduced into the system during the albitisation stage was mainly fixed into this phase. As proposed by Smith and Perseil ( 1997 ) for the Sb-rich rutile from St. Marcel-Praborna Mn-mineralisation (Italy), and considering...
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