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Patos de Minas (octahedrite)
Basic information Name: Patos de Minas (octahedrite)
     This is an OFFICIAL meteorite name.
Abbreviation: There is no official abbreviation for this meteorite.
Observed fall: No
Year found: 1925
Country: Brazil
Mass:help 200 kg
Classification
  history:
NHM Catalogue:  5th Edition  (2000)  Iron
MetBase:  v. 7.1  (2006)  Iron-octahedrite
Meteoritical Bulletin:  MB 93  (2008)  IAB complex
Recommended:  Iron, IAB complex    [explanation]

This is 1 of 68 approved meteorites (plus 1 unapproved name) classified as Iron, IAB complex.   [show all]
Search for other: IAB complex irons, Iron meteorites, and Metal-rich meteorites
Comments: Revised 4 Aug 2008: final writeup
Writeuphelp
Writeup from MB 93:

Patos de Minas (octahedrite)                    18°35'S, 46°32'W

Patos de Minas, Minas Gerais state, Brazil

Find: 1925; main mass in 2002

Iron (IAB complex)

History: A small (18.4 g) end piece of a badly oxidized octahedrite was found in 1925 at the collection of the Escola de Minas Ouro Preto. In 1960 it was donated to Museu Nacional of Rio de Janeiro. The meteorite was mentioned in the British Museum catalog and the Handbook of iron meteorites of Buchwald, when it was named Patos de Minas (octahedrite), or Patos II, to distinguish it from Corrego do Areado, or Patos de Minas (hexahedrite). In 2002, a mass of about 200 kg was found by Paulo Garcia when plowing the land with a tractor.

Physical characteristics: One mass of about 200 kg has average dimensions of 54 × 33 × 22 cm. It is rough, elongated and very weathered, exhibiting some grooves due to terrestrial corrosion and with no signs of fusion crust.
Description: Polished sections display a poor medium Widmanstätten structure of irregular kamacite lamellae 1.1 ± 0.2 mm (max. 2.4 mm), with the Widmanstätten pattern not very obvious. Aspect ratios (length/width) of individual lamellae range from 1 to 8, most being 4-6. Terrestrial corrosion penetrates to a depth of 5 cm. Troilite nodules are very common. The structure is identical to Patos de Minas (octahedrite) so the two masses are considered to be paired.

Geochemistry: (John T. Wasson, UCLA, data obtained by INAA). Bulk composition: Co = 4.8, Ni = 83 (both mg/g); Ga = 67, Cu = 240, As = 15.4, Ir = 1.3 and Au = 1.7 (all in µg/g).

Classification: Iron (IAB complex); very weathered

Type specimens: A total of 1200 g of sample is on deposit at MNRJ/UFRJ/Rio de Janeiro, Brazil. The main mass was recently sold by the finder.

Submitted by: M. Zucolotto.

Buchwald The following entries were found for Patos de Minas (octahedrite) in Buchwald (1975)
[Buchwald, Vagn F. (1975) Handbook of Iron Meteorites. University of California Press, 1418 pp.]
Data from:
  MB93
  Table 3
  Line 19:
State/Prov/County:Patos de Minas, Minas Gerais state, Braz
Date:1925/2002
Latitude:18°35'S
Longitude:46°32'W
Mass (g):218.4
Pieces:2
Class:Iron IAB
Type spec mass (g):1200
Institutions
   and collections
MNRJ: Museu Nacional, Quinta da Boa Vista, Rio de Janeiro, CEP 20940-040, Brazil (institutional address; updated 26 Dec 2011)
UCLA: Institute of Geophysics and Planetary Physics, University of California, Los Angeles, CA 90095-1567, United States (institutional address; updated 17 Oct 2011)
Catalogs:
References: Published in Meteoritical Bulletin, no. 93, MAPS 43, 571-632 (2008)
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Photos:
CreditPhotos
Photos uploaded by members of the Encyclopedia of Meteorites.
    (Caution, these are of unknown reliability)
Alberto Giusta      
Alessandro Takeda   
Andre Moutinho   
Corey Kuo      
David L. Ribeca   
Gabriel Gonçalves Silva   
John Lutzon   
José Carlos de Medeiros Júnior   
Lucian Cojocaru   
Paulo Anselmo Matioli   
Paulo Silvio Rubiano   
Rodrigo Guerra   
Suzanne De Paula      
Svend Buhl            
Geography:

Brazil
Coordinates:
     Catalogue of Meteorites:   (18° 35'S, 46° 32'W)
     Recommended::   (18° 35'S, 46° 32'W)

Statistics:
     This is 1 of 20 approved meteorites from Minas Gerais, Brazil (plus 2 unapproved names)
     This is 1 of 76 approved meteorites from Brazil (plus 6 unapproved names) (plus 7 impact craters)
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Synonymshelp: Patos II (In NHM Cat)

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