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Entrèves
Basic information Name: Entrèves
     This is an OFFICIAL meteorite name.
Abbreviation: There is no official abbreviation for this meteorite.
Observed fall: No
Year found: 1987
Country: Italy
Mass:help 17.3 kg
Classification
  history:
Recommended:  Iron, IAB-MG    [explanation]

This is 1 of 109 approved meteorites classified as Iron, IAB-MG.   [show all]
Search for other: IAB complex irons, Iron meteorites, and Metal-rich meteorites
Comments: Approved 22 Jun 2018
Writeuphelp
Writeup from MB 107:

Entrèves        45°49.14’N, 06°54.82’E

Valle d’Aosta, Italy

Find: May 1987

Classification: Iron meteorite (IAB-MG)

History: A single 20 × 17 × 18 cm mass was found in 1987 by an anonymous bomb-slivers hunter near a moraine at the border of the Brenva glacier, on the Italian side of Mont Blanc, near Entrèves. The sample was subsequently sold to Claude Scavone, a French mineral collector who sold it to Giorgio Tomelleri, an Italian meteorite collector

Physical characteristics: The main mass, weighing 17.3 kg, displays several small fusion pits and is apparently well preserved from rust. A distinct coarse grained Widmanstaetten pattern is visible on sawn and etched surfaces.

Petrography: (V. Moggi Cecchi, G. Pratesi, S. Caporali, UniFi). The 2 × 2 cm cut and etched chip examined contains no silicates. Coarse-grained (~5 mm width) equigranular kamacite grains with 120° grain boundaries can be distinguished, with rare taenite. No Neumann lines are visible. Schreibersite is present as rare laths, up to 150 μm in width and to 1 mm in length, within some kamacite grains and at grain boundaries. Schreibersite is frequently surrounded by iron oxides.

Geochemistry: SEM-EDX spot analyses, all in wt% (V. Moggi Cecchi, G. Pratesi, S. Caporali, Uni-Fi): schreibersite P19.9±0.2Fe44.6±0.6Ni35.6±0.8 (N=6); taenite Fe70.5±0.5Ni29.5±0.2 (N=6); kamacite Fe92.6±0.6Ni7.4±0.2 (N=5). Bulk composition (C. Herd and G. Chen, UAb) Ni=69.0, Co=4.5 (both mg/g); Cu=124, Ga=91, As=11.2, W=1.8, Ir=3.9, Pt=9.9, Pd=3.4, Ru=7.4, Re=0.4, Os=5.2, (all µg/g). Obtained by ICP-MS using North Chile as standard.

Classification: IAB-MG, coarse octahedrite. Composition is consistent with IAB Complex, Main Group (MG). The composition of this meteorites is extremely similar to that of Campo del Cielo. However Neumann bands are absent whereas they are abundant in Campo del Cielo.

Specimens: A polished chip weighing 28 g is on deposit at MSN-FI. Main mass with Giorgio Tomelleri.

Data from:
  MB107
  Table 0
  Line 0:
State/Prov/County:Valle d'Aosta
Date:May 1987
Latitude:45°49.14'N
Longitude:06°54.82'E
Mass (g):17300
Pieces:1
Class:Iron, IAB-MG
Weathering grade:medium
Classifier:V. Moggi Cecchi, S. Caporali, G. Pratesi, Uni-Fi
Type spec mass (g):28
Type spec location:MSN-FI
Main mass:Tomelleri
Finder:Anonymous
Comments:Submitted by Vanni Moggi Cecchi
Institutions
   and collections
UAb: 1-26 Earth Sciences Building, University of Alberta, Edmonton, AB, T6G 2E3, Canada, Canada; Website (institutional address; updated 17 Oct 2011)
MSN-FI: MUSEO DI STORIA NATURALE DELL'UNIVERSITA' DEGLI STUDI DI FIRENZE Via Giorgio La Pira, 4 – 50121 FIRENZE, Italy; Website (institutional address; updated 14 Jan 2015)
UniFi: Università degli Studi di Firenze, P.zza S. Marco, 4 - 50121 Firenze, Italy (institutional address; updated 14 Sep 2013)
Catalogs:
References: Published in Meteoritical Bulletin, no. 107, in preparation (2018)
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Geography:

Italy
Coordinates:
     Recommended::   (45° 49' 8"N, 6° 54' 49"E)

Statistics:
     This is the only approved meteorite from Valle d'Aosta, Italy
     This is 1 of 42 approved meteorites from Italy (plus 22 unapproved names)
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