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Castiglione del Lago
Basic information Name: Castiglione del Lago
     This is an OFFICIAL meteorite name.
Abbreviation: There is no official abbreviation for this meteorite.
Observed fall: No
Year found: 1970
Country: Italy
Mass:help 667 g
Classification
  history:
Meteoritical Bulletin:  MB 105  (2016)  Iron, IAB-MG
Recommended:  Iron, IAB-MG    [explanation]

This is 1 of 112 approved meteorites classified as Iron, IAB-MG.   [show all]
Search for other: IAB complex irons, Iron meteorites, and Metal-rich meteorites
Comments: Approved 11 Jun 2016
Writeuphelp
Writeup from MB 105:

Castiglione del Lago        43.129°N, 12.02317°E

Umbria, Italy

Find: 1970

Classification: Iron meteorite (IAB-MG)

History: A single mass, weighing 667 g, was recovered in 1970 near Castiglion del Lago by a peasant while plowing his field. The peasant preserved the sample for many years in his home considering it just a curiosity until he read an interview of Matteo Chinellato, an Italian meteorite collector, in 2007 who invited people to send him potential meteorites for analysis. Chinellato received the main mass, cut a slice and sent it to MSP and to MSN-Fi for analysis.

Physical characteristics: The main mass has a severely rusted outer surface and has been cut on one side to get the type specimen. An etching of the cut surface showed a distinct Widmanstaetten pattern.

Petrography: (V. Moggi Cecchi, G. Pratesi, S. Caporali, Uni-Fi). Although silicate inclusions are visible on the cut and etched type specimen, the 1 × 1 cm polished section examined does not contain silicates. Metal is formed by coarse-grained (~4 mm width) equigranular kamacite grains with 120° grain boundaries, inside which Neumann lines are visible. Taenite is rare. Scattered schreibersite laths, up to 100 microns in width and to 1 mm in length, can be observed within some kamacite grains and at grain boundaries, frequently surrounded by iron oxides.

Geochemistry: SEM-EDX spot analyses, all in wt% (V. Moggi Cecchi, G. Pratesi, S. Caporali, Uni-Fi): schreibersite P15.5±0.2Fe47.0±0.3Ni37.5±0.4 (N=5); taenite Fe75.4±0.5Ni24.6±0.2 (N=5) ; kamacite Fe93.5±0.6Ni6.5±0.2 (N=7). Bulk composition (C. Herd and G. Chen, UAb) Ni=66.4, Co=4.4 (both mg/g); Cu=151, Ga=98.2, Ge=414, W=1.4, Ir=4.2, Pt=8.1, Pd=3.5, Ru=7.0, Re=0.3, Os=1.4, Ag=1.6, Sb=0.5 (all ?g/g). Obtained by ICP-MS using North Chile as a calibration standard.

Classification: Iron meteorite, IAB-MG, coarse octahedrite. Composition is consistent with IAB Complex, Main Group (MG).

Specimens: An end-cut, weighing 27.2 g, is on deposit at MSP (inventory number MSP2391). A polished thin section is on deposit at MSN-Fi. Main mass with Matteo Chinellato.

Data from:
  MB105
  Table 0
  Line 0:
State/Prov/County:Umbria
Origin or pseudonym:Wheat field
Date:1970
Latitude:43.129°N
Longitude:12.02317°E
Mass (g):667
Pieces:1
Class:Iron, IAB-MG
Classifier:V. Moggi Cecchi, S. Caporali, G. Pratesi, Uni-Fi
Type spec mass (g):27.2
Type spec location:MSP
Main mass:Chinellato
Finder:Anonymous
Comments:Submitted by Vanni Moggi Cecchi
Institutions
   and collections
MSP: Museo di Scienze Planetarie, Via Galcianese 20/H, 59100 Prato, Italy, Italy; Website (institutional address; updated 5 Mar 2014)
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)
Catalogs:
References: Published in Meteoritical Bulletin, no. 105, MAPS 52, 2411, September 2017. http://onlinelibrary.wiley.com/doi/10.1111/maps.12944/full
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Geography:

Italy
Coordinates:
     Recommended::   (43° 7' 44"N, 12° 1' 23"E)

Statistics:
     This is 1 of 4 approved meteorites from Umbria, Italy
     This is 1 of 41 approved meteorites from Italy (plus 23 unapproved names)
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