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Calama 031
Basic information Name: Calama 031
     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 833 g
Classification
  history:
Meteoritical Bulletin:  MB 108  (2020)  CO3
Recommended:  CO3    [explanation]

This is 1 of 621 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 11 Oct 2019
Writeuphelp
Writeup from MB 108:

Calama 031        22°08.90’S, 68°37.72’W

Antofagasta, Chile

Find: 23 Oct 2018

Classification: Carbonaceous chondrite (CO3)

History: many pieces of the meteorite were found by Mr. M. Nepomiluev

Physical characteristics: all samples of the meteorite have a brown fusion crust

Petrography: M. A. Ivanova (Vernad) The meteorite consists of chondrules, their fragments, and a fine grained matrix. Chondrules, mostly porphyritic and barred, are up to 0.23 mm in size. Olivine and pyroxene in chondrules are embedded in glassy mesostasis. CAIs containing spinel, hibonite and melilite occur in the matrix. Small blebbs of Fe,Ni-metal and sulfide grains occur in the matrix. Shock stage is S2, based on undulatory extinction of olivine grains, weathering grade is low.

Geochemistry: Mineral compositions and geochemistry: M. A. Ivanova (Vernad) Olivine: Fa0.63-75.3 (N=56), orthopyroxene: Fs0.8-45.8Wo0.63-4.4 (N=23), Ca-pyroxene: Fs1.4-25.1Wo19.3-46.7 (N=11). Oxygen isotopic compositions: (OU) δ17O=-4.126, -4.44; δ18O=-0.544, -0.874; Δ17O= -3.843, -3.986 (all ‰).

Classification: based on the texture, chondrule sizes, mineral chemistry and bulk oxygen isotopic composition, the meteorite belongs to type CO3.

Specimens: several pieces of the meteorite (165 g total), and 1 polished thin sections are deposited in Vernad. Mt. M. Nepomiluev (ramatahatta2@mail.ru) hold the main mass of the meteorite.

Data from:
  MB108
  Table 0
  Line 0:
State/Prov/County:Antofagasta
Origin or pseudonym:Desert
Date:23 Oct 2018
Latitude:22°08.90'S
Longitude:68°37.72'W
Mass (g):833
Pieces:Many
Class:CO3
Shock stage:S2
Fayalite (mol%):21.9±15.7 (N=56)
Ferrosilite (mol%):5.3±4.7 (N=23)
Wollastonite (mol%):2.1±1.1 (N=23)
Classifier:M. A. Ivanova, Vernad
Type spec mass (g):165
Type spec location:Vernad
Main mass:Mr. M. Nepomiluev, ramatahatta2@mail.ru
Finder:Mr. M. Nepomiluev
Comments:field number is 64-Maxim; submitted by Marina Ivanova
Plots: O isotopes:  
Institutions
   and collections		 OU: Planetary and Space Sciences Department of Physical Sciences The Open University Walton Hall Milton Keynes MK7 6AA United Kingdom, United Kingdom (institutional address; updated 8 Dec 2011)
Vernad: Vernadsky Institute of Geochemistry and Analytical Chemistry, Russia (institutional address; updated 21 Feb 2016)
Catalogs:
References: Published in Meteoritical Bulletin, no. 108 (2020) Meteorit. Planet. Sci. 55, 1146-1150
Find references in NASA ADS:
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Photos:
CreditPhotos
Photos from the Encyclopedia of Meteorites:
Timur Kryachko   
Geography:

Chile
Coordinates:
     Recommended::   (22° 8' 54"S, 68° 37' 43"W)

Statistics:
     This is 1 of 2340 approved meteorites from Antofagasta, Chile (plus 9 unapproved names) (plus 1 impact crater)
     This is 1 of 2369 approved meteorites from Chile (plus 15 unapproved names) (plus 1 impact crater)
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