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Augusto Pestana
Basic information Name: Augusto Pestana
     This is an OFFICIAL meteorite name.
Abbreviation: There is no official abbreviation for this meteorite.
Observed fall: No
Year found: 1977
Country: Brazil
Mass:help 24 kg
Classification
  history:
Recommended:  Iron, IIIE    [explanation]

This is 1 of 15 approved meteorites (plus 1 unapproved name) classified as Iron, IIIE.   [show all]
Search for other: IIIE irons, Iron meteorites, and Metal-rich meteorites
Comments: Approved 16 May 2022
Writeuphelp
Writeup from MB 111:

Augusto Pestana        28° 31’S, 53° 57’ W

Rio Grande do Sul, Brazil

Find: 1977 Oct

Classification: Iron meteorite (IIIE)

History: (Andre L. R. Moutinho) The meteorite was found by a farmer while cleaning a recently acquired property around Oct. 17, 1977. He noticed a very heavy rock when compared to others with similar size. The meteorite was stored for about 44 years and in 2021 a sample was sent to Andre L R Moutinho that confirmed the sample as a meteorite.

Physical characteristics: Elongated shape, 28 kg, 33 × 22 × 16 cm

Petrography: (A.L.R. Moutinho) The meteorites has suffered weathering and no fuscion crust was observed A polished etch slice measuring 50 × 30 mm was studied. The slice shows a typical coarse octahedrite widmanstaetten structure showing swollen kamacite lamellae with bandwidth of 1.82±0.34 mm (n=43). The kamacite lamellae are bordered by taenite and plessite fields that covers 40% of the slice area. Plessite fields are found in many forms as comb, acicular, martensitic and spheroidal. Schreibersite is found as rabhdite needles and as irregular forms. Troilite was not observed in the studied slice. (M. Pereira and F. Genezini/IPEN) Neutron Tomography: kamacite lamellae with bandwidth of 1.4±0.4 mm (n=112).

Geochemistry: North Chile (Filomena) as standard (C. Herd and P. Hill, UAb); ICP-MS method: Ni = 70, Co = 5.8 (both mg/g); Ir = 0.23, Ga = 17, Ge = 41, As = 30, Pt = 1.6, Cu = 168, Sb = 0.21, Pd = 3.8 (all ug/g). (M. S. Navarro and J. Enzweller, DGRN/Unicamp) LA-ICP-MS data: Co = 5.24 (mg/g); Cr = 18.6, Ir = 0.11, Ga = 21.5, Ge = 30.5, As = 24.5, Pt = 0.87, Cu = 183.1, Au = 2.07, W = 0.24, Pd = 5.01, Ag = 0.16, (all ug/g). (R. Scholz and G. N. Queiroga, DEGEO/EM/UFOP). EPMA: kamacite: 6.60% Ni, 0.58% Co.

Classification: Iron, IIIE, based on the coarse octahedrite texture and the composition, following Wasson et al. (1998)). Although the composition is close to IIIAB group, with relatively high Au, the bandwidth indicates IIIE. Aletai (IIIE) also has a similar Au content of 1.86 µg/g.

Specimens: Main mass with finder, 21.5 g at Unicamp, 46.2 g with Andre L R Moutinho,

Bibliography:
  • Wasson J.T., Choi B.-G., Jerde E.A., Ulff-Møller F. (1998) Chemical Classification of Iron Meteorites: XII. New Members of the Magmatic Groups. Geochim. Cosmochim. Acta 62 715-724 (link)
Data from:
  MB111
  Table 0
  Line 0:
State/Prov/County:Rio Grande do Sul
Origin or pseudonym:field
Date:1977 Oct
Latitude:28° 31'S
Longitude:53° 57' W
Mass (g):24kg
Pieces:1
Class:Iron, IIIE
Classifier:C. Herd and P. Hill, Uab. A. P. Crosta, Unicamp. G. Goncalves, USP and A. L. R. Moutinho
Type spec mass (g):21.5
Type spec location:UNICAMP
Main mass:Finder
Finder:Farmer
Comments:Submitted by Andre L R Moutinho and Alvaro Crosta
Institutions
   and collections
UAb: 1-26 Earth Sciences Building, University of Alberta, Edmonton, AB, T6G 2E3, Canada, Canada; Website (institutional address; updated 17 Oct 2011)
USP: Museu de Geociências - USP Rua do Lago, 562 CEP: 05508-080 Butantã - SP Brazil, Brazil; Website (institutional address; updated 22 Oct 2022)
UNICAMP: Institute of Geosciences Minerals Collection Rua Carlos Gomes 250 Cidade Universitária Zeferino Vaz Campinas, SP 13083-855, Brazil; Website (institutional address; updated 17 Dec 2021)
Catalogs:
References: Published in Meteoritical Bulletin, no. 111, in preparation (2022)
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Geography:

Brazil
Coordinates:
     Recommended::   (28° 31'S, 53° 57'W)

Statistics:
     This is 1 of 12 approved meteorites from Rio Grande do Sul, Brazil (plus 1 unapproved name)
     This is 1 of 87 approved meteorites from Brazil (plus 6 unapproved names) (plus 7 impact craters)
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