[meteorite-list] Aiquile is official and approved

From: Galactic Stone & Ironworks <meteoritemike_at_meteoritecentral.com>
Date: Sat, 22 Apr 2017 12:19:16 -0400
Message-ID: <CAKBPJW__Dc0fKcyTpT2ULjUNueANYEqC9UK7ZnJhErhL1QWU_Q_at_mail.gmail.com>

Aiquile

18?17?4"S, 65?8?39"W
Cochabamba, Bolivia
Confirmed fall: 2016 Nov 20
Classification: Ordinary chondrite (H5)

History: A bright fireball appeared over Aiquile, Cochabamba district
of Bolivia, on 20 November 2016, 17:57 local time (UTC-4). Stones fell
in a strewn field of at least 12 ? 2 km (northeasterly direction) in
the following Aiquile communities: Tablamayu, Panam?, Chawar Mayu,
Chaqo K?asa, Barbechos and Cruz Loma. The main bolide fragmentation
occurred over the Tablamayu community, 12 km north of Aiquile. In the
Cruz Loma community, C. Veizaga witnessed the fall of the largest
stone (36.3 kg) about 500 m from him. He recovered the stone and in
the following day the local Aiquile government (Luiz L. Arnez, Marco
Cardona, Franz Navia, William Rodriguez, Jesus Yave) took the stone to
the city museum. In the Panam? community, Roberto Soto witnessed the
fall and recovered two other fragments (565 g, 2.2 kg). SERGEOMIN
(Miguel A. Muriel, G. Villca, A. Perez), UMSA (Gonzalo Pereira),
Brazil NM collaborators (Andre R. Moutinho, Jos? M. Monzon) and S.
Medina found additional fragments in the Panam? community. A. Moutinho
found a 98 g fragment which was used for classification.

Physical characteristics: The 36.3 kg stone was almost fully covered
with fusion crust and remaglypts, with only small pitted corners (47 ?
17 ? 26 cm); the 2.26 kg stone is semi-prismatic and almost fully
covered with fusion crust; the 565 g piece is a fragment mostly
without fusion crust.

Petrography: Medium shock stage (S3), chondritic texture and
mineralogy and mineral compositions of an equilibrated ordinary
chondrite. Porphyritic olivine and radial pyroxene chondrules
dominate.

Geochemistry: Microprobe analyses show an equilibrated olivine and
pyroxene composition of Olivine (Fa18.3?0.5; n=53), low-Ca pyroxene
(Fs 15.7?0.7; n=37). Mean Cr2O3 of olivine is 0.048 wt.% for both
matrix and clasts areas.

Classification: H group classification based on: chondrule mean
apparent diameter (~0.3 mm), content of metallic Fe,Ni + FeS (9.9
vol%), Co content of kamacite (0 - 0.3 wt%). Petrologic type 5
classification based on chondritic texture, and plagioclase <50 ?m.
Shock S3 based on undulatory extinction, irregular fractures of
olivine. Most fragments show no brecciation, but some have slightly
darker gray clasts with boundaries indiscernible under the microscope.
Although both areas show identical composition, the darker areas show
apparently well defined chondrules. Cathodoluminescence images also
are very similar in the two areas. Some isolated melt pockets and
small dark inclusions were observed.

Specimens: 36.3 kg, 2.26 kg, 565 g in Museu Municipal del Charango
(Aiquile), 45 g MNRJ, 39 g Universidad Autonoma de San Andr?s (UASA),
40 g Andre Moutinho, 38 g Jos? Maria Monzon

Bulletin link - https://www.lpi.usra.edu/meteor/metbull.php?code=65369

--------------------

21st Century Witnessed Falls - http://www.galactic-stone.com/pages/falls

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Received on Sat 22 Apr 2017 12:19:16 PM PDT