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Arraias
Basic information Name: Arraias
     This is an OFFICIAL meteorite name.
Abbreviation: There is no official abbreviation for this meteorite.
Observed fall: No
Year found: 2015
Country: Brazil
Mass:help 25 kg
Classification
  history:
Recommended:  Iron, IIAB    [explanation]

This is 1 of 136 approved meteorites classified as Iron, IIAB.   [show all]
Search for other: IIAB irons, Iron meteorites, and Metal-rich meteorites
Comments: Approved 11 Jun 2019
Writeuphelp
Writeup from MB 108:

Arraias        12°57.29’S, 46°55.03’W

Tocantins, Brazil

Find: 2015 Apr

Classification: Iron meteorite (IIAB)

History: Discovered in April 2015 near the town of Arraias, in the Mata da Ursa region, by a gold prospector named Vicente, in an excavation of gold tailings. He warned his boss about the finding, Mr. Jose Domingos Scarpellini, who subsequently took the meteorite to Curitiba.

Physical characteristics: A mass of 25 kg and approximate dimensions of 12 × 15 × 24 cm, rather smooth, but with large and irregular regmaglypts. There are no signs of fusion crust and it presents a weathered surface showing some with an oxide crust of about 1 mm

Petrography: (Zucolotto, M.E., MN/UFRJ) The etched section shows a typical hexahedrite structure with bright and frosty kamacite areas and several sets of Neumann lines crossing the entire surface. There is no sign of fusion crust and heat affected zone. Troilites are present as small nodules. Phosphides occur as numerous rhabdite crystals as both prisms and plates.

Geochemistry: 5.42% Ni; 0.45% Co; 57.4 ppm Ga; <200ppm Ge; 30.8 ppm Ir; 0.512 ppm Au (INAA, J.T. Wasson, UCLA). Kamacite 5.34% Ni; 0.41% Co. Phosphides 27% Ni; 14.7% P ( EPMA Amanda Tosi LABSONDA/IGEO/UFRJ)

Classification: Iron, IIAB

Specimens: 80g MNRJ, 25 kg Curitiba, Thais Scarpellini

Data from:
  MB108
  Table 0
  Line 0:
State/Prov/County:Tocantins
Origin or pseudonym:field
Date:2015 Apr
Latitude:12°57.29'S
Longitude:46°55.03'W
Mass (g):25000
Pieces:1
Class:Iron, IIAB
Weathering grade:low
Classifier:J.T. Wasson, UCLA
Type spec mass (g):80
Type spec location:MNRJ
Main mass:Curitiba
Finder:Vicente
Comments:Submitted by Maria Elizabeth Zucolotto
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. 108, in preparation (2019)
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Photos:
CreditPhotos
Photos uploaded by members of the Encyclopedia of Meteorites.
    (Caution, these are of unknown reliability)
Andre Moutinho   
Geography:

Brazil
Coordinates:
     Recommended::   (12° 57' 17"S, 46° 55' 2"W)

Statistics:
     This is the only approved meteorite from Tocantins, Brazil (plus 1 impact crater)
     This is 1 of 77 approved meteorites from Brazil (plus 6 unapproved names) (plus 7 impact craters)
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