Castiglione del Lago meteorite, Castiglione del Lago, Perugia Province, Umbria, Italyi

Regional Level Types
Castiglione del Lago meteorite	Meteorite Fall Location
Castiglione del Lago	Commune
Perugia Province	Province
Umbria	Region
Italy	- not defined -

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

A single mass, weighing 667 g, was recovered in 1970 near Castiglione 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 in 2007 an interview of the well-known Italian meteorite collector Matteo Chinellato, who invited people to send him potential meteorites for analysis. Chinellato received the main mass, cut a slice and sent it to Museo di Scienze Planetarie (MSP), Prato, and Museo di Storia Naturale dell'Università degli Studi di Firenze (MSN-Fi), Florence, for analysis. An end-cut, weighing 27.2 g, is preserved at MSP; a polished thin section at MSN-Fi.

Although silicate inclusions are visible on the cut and etched 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. Bulk composition include Ni=66.4 mg/g, Co=4.4 mg/g; Cu=151 μ/g, Ga=98.2 μ/g, Ge=414 μ/g, W=1.4 μ/g, Ir=4.2 μ/g, Pt=8.1 μ/g, Pd=3.5 μ/g, Ru=7.0 μ/g, Re=0.3 μ/g, Os=1.4 μ/g, Ag=1.6 μ/g, Sb=0.5 μ/g.

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