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Calama 158
Basic information Name: Calama 158
     This is an OFFICIAL meteorite name.
Abbreviation: There is no official abbreviation for this meteorite.
Observed fall: No
Year found: 2019
Country: Chile
Mass:help 17 g
Recommended:  Ureilite    [explanation]

This is 1 of 613 approved meteorites classified as Ureilite.   [show all]
Search for other: Achondrites, Ureilites
Comments: Approved 29 May 2021
Writeup from MB 110:

Calama 158        22°27.59’S, 68°50.46’W

Antofagasta, Chile

Find: 20 Oct 2019

Classification: Ureilite

History: The meteorite was found in the Atacama desert by Mr. T. V. Kryachko on the October 20, 2019.

Physical characteristics: Physical properties: A single stone of 17 g weight is ovoid-shaped and has partially broken black surface with the remnants of fusion crust.

Petrography: The meteorite has granular texture with triple junctions of the grain boundaries. Grain size is in a range 0.5-1.5 mm. The rock consists of olivine (~80 vol.%) and clinopyroxene (~20 vol.%), graphite-diamond aggregates, and accessory Fe,Ni metal and troilite, and weathering products (Fe hydroxides). Aggregates of graphite and diamond occur both on the grain contacts and inside the olivine and pyroxene grains. Olivine grains have rims enriched in fine-grained metal and minor troilite inclusions on the contacts with the carbon phases and along the grain boundaries. Olivine has sharp optical extinction.

Geochemistry: Mineral compositions and geochemistry:(N. N. Kononkova, EPMA, Vernad): Olivine is zoned from Fo82 Fe/Mn=46.1 (core) to Fo97 Fe/Mn=4.3 (rim); Pyroxene is En78.1±0.2 Wo6.6±0.1 (Fe/Mn=23.3).

Classification: Ureilite, moderately weathered.

Specimens: Samples: Type specimen of 4.7 g and one thin polished section are on deposit in Vernad. Mr. Kryachko holds the main mass.

Data from:
  Table 0
  Line 0:
Date:20 Oct 2019
Mass (g):17
Fayalite (mol%):18 (core), 3 (rim)
Ferrosilite (mol%):21.9±0.2 (N=16)
Wollastonite (mol%):6.6±0.1 (N=16)
Classifier:Lorenz C. A., Vernad
Type spec mass (g):4.7
Type spec location:Vernad
Main mass:Mr. T. Kryachko, bredfild@mail.ru
Finder:Mr. T. Kryachko
Comments:Field name is 6-26.; submitted by Lorenz C.A., Vernad
   and collections
Vernad: Vernadsky Institute of Geochemistry and Analytical Chemistry, Russia (institutional address; updated 21 Feb 2016)
References: Published in Gattacceca J., McCubbin F.M., Grossman J., Bouvier A., Chabot N.L., D'Orazio M., Goodrich C., Greshake A., Gross J., Komatsu M., Miao B., and Schrader D. (2022) The Meteoritical Bulletin, No. 110. Meteorit. Planet. Sci. 1-4
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Photos uploaded by members of the Encyclopedia of Meteorites.
    (Caution, these are of unknown reliability)
Ryan Upchurch   

     Recommended::   (22° 27' 35"S, 68° 50' 28"W)

     This is 1 of 2320 approved meteorites from Antofagasta, Chile (plus 9 unapproved names) (plus 1 impact crater)
     This is 1 of 2349 approved meteorites from Chile (plus 15 unapproved names) (plus 1 impact crater)
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