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Sierra Gorda 071
Basic information Name: Sierra Gorda 071
     This is an OFFICIAL meteorite name.
Abbreviation: There is no official abbreviation for this meteorite.
Observed fall: No
Year found: 2018
Country: Chile
Mass:help 25 g
Classification
  history:
Meteoritical Bulletin:  MB 111  (2023)  CO3
Recommended:  CO3    [explanation]

This is 1 of 645 approved meteorites (plus 1 unapproved name) classified as CO3.   [show all]
Search for other: Carbonaceous chondrites, Carbonaceous chondrites (type 3), CM-CO clan chondrites, and CO chondrites
Comments: Approved 6 Aug 2022
Writeuphelp
Writeup from MB 111:

Sierra Gorda 071        22°30.11’S, 69°07.89’W

Antofagasta, Chile

Find: 2018 Oct 12

Classification: Carbonaceous chondrite (CO3)

History: One piece of the meteorite was found by Mr. T. Kryachko

Physical characteristics: Sample with brown fusion crust

Petrography: M. A. Ivanova (Vernad) Meteorite consists of chondrules, their fragments, CAIs set in a fine grained matrix. Chondrules (up to 0.3 mm) are mostly porphyritic and barred. Chondrule mesostasis is glassy. CAIs contain spinel, hibonite, melilite and perovskite. Small grains of Fe,Ni-metal and sulfide grains occur in the matrix. Shock stage is S1 based on sharp exinction of olivine.

Geochemistry: Mineral compositions and geochemistry: M. A. Ivanova (Vernad) Olivine: Fa1.10-70.6 (N=45), orthopyroxene: Fs1.39-54.1Wo0.37-4.64 (N=42), pigeonite: Fs15.28±12.83Wo9.75±4.41 (N=12); augite Fs5.39±2.52Wo36.04±5.22 (N=13); diopside in CAIs Fs1.73Wo51.48.

Classification: Carbonaceous chondrite (CO3).

Specimens: one sample of the meteorite (5.1 g), and 1 polished thin section are deposited in Vernad. Mt. T. Kryachko ([email protected]) hold the main mass of the meteorite.

Data from:
  MB111
  Table 0
  Line 0:
State/Prov/County:Antofagasta
Date:2018 Oct 12
Latitude:22°30.11'S
Longitude:69°07.89'W
Mass (g):25
Pieces:1
Class:CO3
Shock stage:S1
Fayalite (mol%):23.6 (1.10-70.6, N=45)
Ferrosilite (mol%):13.2 (1.39 - 54.1, N=42)
Wollastonite (mol%):1.61 (0.37-4.64)
Classifier:Ivanova M. A., Vernad
Type spec mass (g):5.1
Type spec location:Vernad
Main mass:Mr. T. Kryachko, [email protected]
Finder:Mr. T. Kryachko
Comments:Field name is 4-1;; submitted by Ivanova V.A., Vernad
Institutions
   and collections		 Vernad: Vernadsky Institute of Geochemistry and Analytical Chemistry, Russia (institutional address; updated 21 Feb 2016)
Catalogs:
References: Published in Gattacceca J., McCubbin F. M., Grossman J. N., Schrader D. L., Chabot N. L., D’Orazio M., Goodrich C., Greshake A., Gross J., Joy K. H., Komatsu M. and Miao B. (2023) The Meteoritical Bulletin, No. 111. Meteoritics & Planetary Science 58, 901–904. ?
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Geography:

Chile
Coordinates:
     Recommended::   (22° 30' 7"S, 69° 7' 53"W)

Statistics:
     This is 1 of 3440 approved meteorites from Antofagasta, Chile (plus 12 unapproved names) (plus 1 impact crater)
     This is 1 of 3469 approved meteorites from Chile (plus 13 unapproved names) (plus 1 impact crater)
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