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Basic information Name: Claromecó
     This is an OFFICIAL meteorite name.
Abbreviation: There is no official abbreviation for this meteorite.
Observed fall: No
Year found: 1963
Country: Argentina
Mass:help 26 kg
Meteoritical Bulletin:  MB 105  (2016)  L5/6
Recommended:  L5/6    [explanation]

This is 1 of 175 approved meteorites classified as L5/6.   [show all]
Search for other: L chondrites, L chondrites (type 4-7), Ordinary chondrites, and Ordinary chondrites (type 4-7)
Comments: Approved 22 Jan 2016
Writeup from MB 105:

Claromecó        38°48.264’S, 60°07.386’W

Buenos Aires, Argentina

Find: 1963

Classification: Ordinary chondrite (L5/6)

History: Two reddish brown meteoritic stones of 13 kg each were found in 1963 by Mr. F. Massigogge. The stones were leaning against a windmill in his farm at Argentine Pampas, and were reported a few years ago to geologist Rogelio Daniel Acevedo. The farm owner knew the exact location where he had found the stones. No other specimens are known.

Physical characteristics: The meteorites have a rusty appearance that is indicative of having experienced significant terrestrial weathering and the matrix is oxidized. About 90% of the original specimens were covered by a fusion crust. The degree of weathering is variable on the cm-scale of the thin section. The sample is moderately weathered and about half of the metals have been destroyed. Close to the surface most of the metal is gone. Once cut the metal grains are barely oxidized by terrestrial alteration, but the matrix is significantly colored by iron staining.

Petrography: Rogelio D. Acevedo (CONICET), J. M. Trigo-Rodriguez (CSIC-IEEC), A. Bischoff and S. Ebert, (IfP), I. Subías, J. Reche and A. Bergara Pinto (UAdB). The sample is well equilibrated and recrystallized. Thus, in some area, the meteorite looks like a type 6 chondrite, and in other areas chondrules can be clearly observed indicating a type 5 classification. Thus, a Type 5/6 classification is most appropriate. The olivines show planar fractures in olivine, clearly indicating shock stage S3.

Geochemistry: Mineral compositions: Olivine: Fa24.9±0.4 (n =10); Pyroxene: Fs20.7±0.4Wo1.5±0.4 (n = 10).

Classification: L5/6 Ordinary chondrite

Specimens: 459.2 g at CONICET and 20 g plus two thin sections at Institute of Space Sciences (CSIC-IEEC).

Data from:
  Table 0
  Line 0:
State/Prov/County:Buenos Aires
Origin or pseudonym:town
Mass (g):26000
Shock stage:S3
Weathering grade:W2/3
Fayalite (mol%):24.9±0.4
Ferrosilite (mol%):20.7±0.4
Wollastonite (mol%):1.5±0.4
Classifier:J.M. Trigo-Rodríguez and M. Martínez-Jiménez, CSIC-IEEC; A. Bischoff and S. Ebert, IfP; R. Acebedo, CONICET; J. Reche and A. Bergara Pinto, UAdB; I. Subías, Univ. Zaragoza
Type spec mass (g):20 g
Type spec location:CSIC-IEEC
Main mass:private owner
Finder:F. Massigogge
Comments:Submitted by Josep M. Trigo-Rodríguez
   and collections
IfP: Institut für Planetologie, Wilhelm-Klemm-Str. 10, 48149 Münster, Germany (institutional address; updated 23 Jan 2012)
CSIC-IEEC: Institute of Space Sciences (CSIC-IEEC), Campus UAB, Facultat de Ciències, Torre C-5 Parells, 2ª planta, E-08193 Bellaterra, Barcelona, Spain; Website (institutional address; updated 19 Dec 2015)
CONICET: National Scientific and Technical Research Council (CONICET). Godoy Cruz 2290 (C1425FQB) - Autonomous City of Buenos Aires, Argentina (institutional address; updated 22 Jan 2016)
UAdB: Departament de Geologia Universitat Autònoma de Barcelona Facultat de Ciències, Campus UAB 08093 Bellaterra, Barcelona, Spain (institutional address; updated 24 Jan 2016)
References: Published in Meteoritical Bulletin, no. 105, MAPS 52, 2411, September 2017. http://onlinelibrary.wiley.com/doi/10.1111/maps.12944/full
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     Recommended::   (38° 48' 16"S, 60° 7' 23"W)

     This is 1 of 13 approved meteorites from Buenos Aires, Argentina (plus 3 unapproved names)
     This is 1 of 80 approved meteorites from Argentina (plus 9 unapproved names) (plus 2 impact craters)
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