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Caçapava do Sul
Basic information Name: Caçapava do Sul
     This is an OFFICIAL meteorite name.
Abbreviation: There is no official abbreviation for this meteorite.
Observed fall: No
Year found: unknown
Country: Brazil
Mass:help 27 kg
Meteoritical Bulletin:  MB 107  (2018)  Iron, IID
Recommended:  Iron, IID    [explanation]

This is 1 of 27 approved meteorites classified as Iron, IID.   [show all]
Search for other: IID irons, Iron meteorites, and Metal-rich meteorites
Comments: Approved 2 Sep 2018
Writeup from MB 107:

Caçapava do Sul        30°41’34.9"S, 53°39’05.1"W

Rio Grande do Sul, Brazil

Find: about 1908

Classification: Iron meteorite (IID)

History: The meteorite was found around 1908 among the remains of an abandoned country seat. The stone drew attention due to its weight and the farmer decided to use it to amuse visitors. Prof. Elver Ubirajara had heard about the mysterious rock since he was a boy. Recently, thinking it to be a meteorite, he spent many years in finding the current owner of the stone, Mr. João A. R. Lopes. When the meteoritic nature was confirmed by the MNRJ/UFRJ, it was donated to the local university (UNIPAMPA).

Physical characteristics: A rough pear-shaped mass of 27 kg, with average dimensions of 27 × 21 × 12 cm and weathered surface.

Petrography: (Zucolotto, M.E., MNRJ, IGEO-UFRJ) The etched sections display a medium Widmanstätten structure, consisting of kamacite lamellae bordered by taenite and plessite fields. The kamacite lamellae are straight, swollen and have an average bandwidth of 0.65±0.15 mm and microhardness HV 325±30. The kamacite has an indistinct ε-structure. Taenite and plessite cover 30-40% per area, mainly as comb and net plessite fields and some with martensitic varieties. The broad taenite lamellae have a mean microhardness HV 500±30. Schreibersite occurs as small blocks or skeletal crystals, mainly enveloped by swathing kamacite broad lamellae. Troilite is very rare as scattered nodules.

Geochemistry: Bulk composition (INAA - J.T. Wasson, UCLA) in wt%: Ni = 9.43, Co = 0.66; and in ppm: Cr=90, Cu=307, Ga=70.8, As=4.3, W=2.8, Ir=21.6 and Au=0.56. Presents the highest Ir among IID irons and one of the lowest Au and As values. (EPMA - A. Tosi, LABSONDA/IGEO-UFRJ) kamacite 7.32 ± 0.15 wt.% Ni and 0.65 ± 0.06 % Co content and taenite lamellae 21.5±0.5 wt.% Ni and 0.35±0.05 wt.% Co.

Classification: (J.T. Wasson, UCLA) Iron (IID), medium octahedrite

Specimens: 94.8 g MNRJ, IGEO-UFRJ, main mass UNIPAMPA.

Data from:
  Table 0
  Line 0:
State/Prov/County:Rio Grande do Sul
Origin or pseudonym:Countryside
Date:about 1908
Mass (g):27000
Class:Iron, IID
Classifier:J.T. Wasson, UCLA
Type spec mass (g):94.8
Type spec location:MNRJ/UFRJ
Main mass:UNIPAMPA
Finder:Elver Ubirajara Teixeira
Comments:Submitted by M. Zucolotto
   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)
IGEO-UFRJ: Instituto de Geociências, Universidade Federal do Rio de Janeiro, Brazil (institutional address; updated 17 Oct 2014)
References: Published in Meteoritical Bulletin, no. 107, MAPS 55, 460-462
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     Recommended::   (30° 41' 35"S, 53° 39' 5"W)

     This is 1 of 12 approved meteorites from Rio Grande do Sul, Brazil (plus 1 unapproved name)
     This is 1 of 88 approved meteorites from Brazil (plus 6 unapproved names) (plus 7 impact craters)
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