[meteorite-list] Met Bulletin Update - Ardón

[Galactic Stone & Ironworks]

Hi Bulletin Watchers,

One new fall has been approved.  It is an L6 fall from Spain in 1931.

Link - http://www.lpi.usra.edu/meteor/metbull.php?code=59522

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Ardón        42°26.18'N, 5°33.63'W
Castilla y Leon, Spain
Fell: 9 July 1931
Classification: Ordinary chondrite (L6)

History: Rosa González Pérez, who was 11 years old at the time,
witnessed this meteorite falling in front of her, just after seeing a
bolide in the sky. In a recent telling of the event, she reported that
she immediately collected the specimen from the ground "having the
feeling that the meteorite was still hot." She kept the specimen in a
box, where it has been preserved for 80 years. She kept the meteorite
as a "family secret" until she explained the event to her nephew and
niece. She still knows the exact recovery location, as the meteorite
fell in a known Ardón street. No other specimens are known.

Physical characteristics: About 90% of the 5.48 g specimen is covered
by a fresh fusion crust. Once cut, the metal grains are intact and
barely oxidized by terrestrial alteration. The appearance of the thin
sections also supports not being exposed to significant terrestrial
weathering.

Petrography (M. Weyrauch, A. Bischoff, IfP; J.M. Trigo-Rodríguez,
CSIC-IEEC; J. Llorca, UPC): Contains minor chromite and ilmenite. The
meteorite is fresh, and moderately shocked with shock veins.

Geochemistry: Olivine, Fa23.7±0.4; range Fa23.1-24.4, n=22. Low Ca
pyroxene Fs20.4±0.2Wo1.5±0.2, range Fs20.0-20.7Wo1.1-2.0, n=19. Mean
plagioclase: An10.3±0.5Ab84.3±1.2; range: An9.2-11.5Ab81.8-86.3, n=24.

Classification: L6 Ordinary chondrite

Specimens: 1 g at Institute of Space Sciences (CSIC-IEEC) plus two thin sections

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Best regards and Happy Huntings,

MikeG


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