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Calama 082
Basic information Name: Calama 082
     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 2.85 kg
Classification
  history:
Recommended:  Diogenite-pm    [explanation]

This is 1 of 42 approved meteorites classified as Diogenite-pm.   [show all]
Search for other: Achondrites, Diogenites, and HED achondrites
Comments: Approved 10 Mar 2020
Writeuphelp
Writeup from MB 109:

Calama 082        22°8.50’S, 68°37.37’W

Antofagasta, Chile

Find: 19 Oct 2019

Classification: HED achondrite (Diogenite, polymict)

History: The numerous fragments of meteorite were collected over 50 m2 by Mr. Ilya Chaplygin, who was searching for meteorites in the Atacama Desert.

Physical characteristics: Physical properties: The meteorite has more than 100 fragments. The largest pieces are 843, 476 and 350 g. The stone of 843 g of mass has isometric shape; half of the stone surface is covered with dark-gray fusion crust. Smaller fragments have not fusion crust and are dark gray in color. The brecciated texture is visible. Total mass of collected fragments is 2850 g.

Petrography: (Lorenz C. A., Vernad) the meteorite has brecciated texture. The poorly sorted breccia comprises of fragments of pyroxenites, melt matrix breccias, minor fragments of pyroxene-feldspar rocks, recrystallized breccias and sulfide-silicate breccias settled in the fine-grained clastic matrix. Main phase is pyroxene; feldspar is minor, olivine, chromite, silica, troilite and metal are rare. The melt matrix breccia fragments are up to 2 cm of size. The rock is crossed by rare shock melt veins.

Geochemistry: Mineral compositions and geochemistry: (N. N. Kononkova, EMPA, Vernad; T. Kryachko, SEM, Technograd, Moscow): Low-Ca pyroxene is En63.5-En79Wo1.4-4.5 (Fe/Mn=21.5-35.3); Olivine Fo62.3-66.3; Pyroxene in eucritic fragments En37-62Wo2.4-4.4 with lamellae of En41.5-50.5Wo41.5-44.6. Feldspar An87.4Ab11.6-An91.9Ab8.1

Classification: polymict diogenite

Specimens: The type specimen of 564.3 g and four thin sections are on deposit at Vernad. Mr. Chaplygin holds the main mass.

Data from:
  MB109
  Table 0
  Line 0:
State/Prov/County:Antofagasta
Date:19 Oct 2019
Latitude:22°8.50'S
Longitude:68°37.37'W
Mass (g):2850
Pieces:many
Class:Diogenite-pm
Classifier:Lorenz C. A., Vernad
Type spec mass (g):564.3
Type spec location:Vernad
Main mass:Mr. I. Chaplygin, ichap@rambler.ru
Finder:Chaplygin Ilya
Comments:Analysts: N. N. Kononkova, Vernad; T. Kryachko (Technograd, Moscow); submitted by Lorenz C. A. (Vernad)
Institutions
   and collections
Vernad: Vernadsky Institute of Geochemistry and Analytical Chemistry, Russia (institutional address; updated 21 Feb 2016)
Catalogs:
References: Published in Meteoritical Bulletin, no. 109, in preparation (2020)
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Geography:

Chile
Coordinates:
     Recommended::   (22° 8' 30"S, 68° 37' 22"W)

Statistics:
     This is 1 of 1663 approved meteorites from Antofagasta, Chile (plus 5 unapproved names) (plus 1 impact crater)
     This is 1 of 1691 approved meteorites from Chile (plus 11 unapproved names) (plus 1 impact crater)
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