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Capão do Leão
Basic information Name: Capão do Leão
     This is an OFFICIAL meteorite name.
Abbreviation: There is no official abbreviation for this meteorite.
Observed fall: No, but it is possible
Year found: 2019
Country: Brazil
Mass:help 210 g
Classification
  history:
Recommended:  L5    [explanation]

This is 1 of 7217 approved meteorites (plus 4 unapproved names) classified as L5.   [show all]
Search for other: L chondrites, L chondrites (type 4-7), Ordinary chondrites, and Ordinary chondrites (type 4-7)
Comments: Approved 8 Apr 2021
Writeuphelp
Writeup from MB 110:

Capão do Leão        31º46’3"S, 52º26’55"W

Rio Grande do Sul, Brazil

Find, possible fall: 2019

Classification: Ordinary chondrite (L5)

History: (José M. Monzon, Rodrigo Guerra) On the night of April 10, 1999, a driver from the Federal University of Pelotas, Altamir Manuel Gonçalves, was fishing on the banks of Arroio Padre Doutor, near the Capão do Leão city, in the state of Rio Grande do Sul/Brazil. According to his report, at that moment there was a flash in the sky and he felt a strong gust of wind, followed by the noise of something cutting through the air. Altamir collected some samples, which were not meteorites and from the photos published in some news, they appeared to be slag. Following this bolide history, in 2019, José Maria Monzon, and his son Camilo I. Monzon, decided to do a fieldwork in the region during October and November, during which they found five samples, totaling about 210 g.

Physical characteristics: Weathered stones, totaling 210 g, partially covered with dark-brown fusion crusted.

Petrography: (M. E. Zucolotto, MN/UFRJ) Two polished thin sections were exhamined under OM and EPMA, showing discernible chondrules and chondrules fragments. Chondrule types include BO, RP, PO, POP and GOP. One chondrule is fully enveloped by a wide troilite rim. Chondrule sizes range from 0.3 to 1.5 mm with average diameter of 0.78 mm. Clinoenstatite grains are present in PP chondrules. Plagioclase occur as small grains, few larger than 50 µm in size. Many metal grains show dark plessite etch, most of them have tetrataenite rim. Neuman lines in kamacite are present. Troilite is polycrystalline. Olivine and pyroxene show weak mosaicism, planar fractures and undulatory extinction, suggesting shock stage S3/4. Less than 20% of Few Fe-Ni metal present oxidation and no evidence of weathering in silicate minerals indicating weathering grade W1.

Geochemistry: (A. Tosi, IGEO/UFRJ) Electron microprobe: olivine Fa26.1 ± 0.9 (n=13); low Ca pyroxene Fs20.5±1.1Wo0.98±0.5 (n=9); plagioclase Ab80.4±1.75An10.2±0.60Or9.42±2.0 (n=8). Kamacite Ni=6.79±0.23 wt. %, Co=0.835±0.16 wt. % (n=7).

Classification: L5 brecciated ordinary chondrite. Weathering (W1) and moderated shocked (S3/4)

Specimens: MNRJ 21.5 g and Finder 188.5 g type specimen

Data from:
  MB110
  Table 0
  Line 0:
State/Prov/County:Rio Grande do Sul
Origin or pseudonym:Gully of the city
Date:2019
Latitude:31º46'3"S
Longitude:52º26'55"W
Mass (g):210
Pieces:6
Class:L5
Shock stage:S3/4
Weathering grade:W1
Fayalite (mol%):26.3±0.9 (n=13)
Ferrosilite (mol%):20.5±1.1 (n=9)
Wollastonite (mol%):0.98±0.5 (n=9)
Classifier:M.E. Zucolotto, MN/UFRJ and A.A.Tosi, IGEO/UFRJ
Type spec mass (g):21.5
Type spec location:MNRJ
Main mass:Finder
Finder:José Maria Monzon
Comments:Submitted by M. E. Zucolotto and A. Tosi; submitted by Amanda Tosi and M. E. Zucolotto
Institutions
   and collections
MNRJ: Museu Nacional, Quinta da Boa Vista, Rio de Janeiro, CEP 20940-040, Brazil (institutional address; updated 26 Dec 2011)
Catalogs:
References: Published in Meteoritical Bulletin, no. 110, in preparation (2021)
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Geography:

Brazil
Coordinates:
     Recommended::   (31° 46' 3"S, 52° 26' 55"W)

Statistics:
     This is 1 of 11 approved meteorites from Rio Grande do Sul, Brazil (plus 1 unapproved name)
     This is 1 of 82 approved meteorites from Brazil (plus 6 unapproved names) (plus 7 impact craters)
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