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Calama 008
Basic information Name: Calama 008
     This is an OFFICIAL meteorite name.
Abbreviation: There is no official abbreviation for this meteorite.
Observed fall: No
Year found: 2017
Country: Chile
Mass:help 11.2 g
Classification
  history:
Recommended:  L6    [explanation]

This is 1 of 10991 approved meteorites (plus 6 unapproved names) classified as L6.   [show all]
Search for other: L chondrites, L chondrites (type 4-7), Ordinary chondrites, and Ordinary chondrites (type 4-7)
Comments: Approved 19 Apr 2018
Writeuphelp
Writeup from MB 107:

Calama 008        22°27’32.7" S, 68°39’12" W

Antofagasta, Chile

Find: 2017 Oct 19

Classification: Ordinary chondrite (L6)

History: Meteorite (11.23 g) was found 19 October 2017 by the UrFU meteorite expedition-2017 in Chile (Pastukhovich A.Yu., Larionov M.Yu., Kruglikov N.A., Kolunin R.N.) near Chiu-Chiu, Calama region.

Physical characteristics: Total mass is 11.23 g. The meteorite has roughly rounded shape. Exterior of the stone is desert polished. The surface and interior of the meteorite is light to dark brown in color due to Fe-hydroxides. No fusion crust was observed.

Petrography: Classification (V.V. Sharygin, SIGM and UrFU). Petrographic observation of a polished thin section shows very rare chondrules in a coarse-middle recrystallized matrix. Such chondrules are very poorly delineated and their sizes vary from 500 µm to 3 mm. They have porphyritic texture and mainly consist of olivine, low-Ca-pyroxene and plagioclase, and ± diopside, chromite and blebs of troilite and FeNi-metal. Chromite-plagioclase segregation (300 µm, chondrule ?) was also observed in the matrix. Olivine, low-Ca-pyroxene and plagioclase are main minerals in matrix. Plagioclase grains are larger than 50-100 µm. This indicates petrologic type 6. Undulatory extinction and irregular fractures in olivine, as well as the absence of opaque shock veins and melt pockets, indicate a shock stage of S2. Majority of grains of FeNi metal (kamacite, taenite, rarely tetrataenite, up to 500 µm) and troilite (200-500 µm) are fresh. Weathering products (goethite and other Fe-Ni-hydroxides) occur as in situ partial alteration of FeNi-metals and troilite and fill microfractures in minerals from matrix and chondrules (weathering grade – W2). Clinopyroxene, chromite, chlorapatite and merrillite (200-400 µm) occur locally in the matrix. Single inclusion (5 µm) of molybdenite was found in troilite grain.

Geochemistry: EDS-WDS analyses (V. V. Sharygin, SIGM and UrFU). The primary chondrite paragenesis includes olivine Fa25.59±0.50 (N=27), orthopyroxene Fs21.72±0.28Wo1.61±0.21 (N=22), plagioclase Ab83.5An10.8Or5.7 (N=23), Cr-bearing clinopyroxene En45.3Fs8.6Wo46.1 (N=6), chromite Crt82.3Spl12.4 (N=16), chlorapatite, merrillite and FeNi-metals. Chlorapatite contains F (up to 0.5 wt.%); Cl – 5.30 wt.% (N=3). Merrillite is poor in FeO (0.6-0.7 wt.%). Composition of metals (in wt.%): kamacite (N=9) – Fe 93.71±1.55, Ni – 5.39±1.01, Co – 0.97±0.17; taenite (N=17) – Fe 68.28±4.53, Ni 31.24±4.67, Co 0.50±0.09; tetrataenite (N=3) – Fe 49.22, Ni 50.29, Co 0.33. Fe-Ni-hydroxides sometimes contain 22.6-38.3 wt.% NiO.

Classification: Ordinary chondrite. L6, S2, W2. In chemical composition of olivine and low-Ca pyroxene this meteorite seems to be similar to Calama 006.

Specimens: 8.4 g cut-off – UrFU; 1.25 g cut-off and thin section – SIGM.

Data from:
  MB107
  Table 0
  Line 0:
State/Prov/County:Antofagasta
Origin or pseudonym:limestone deflation plain
Date:2017 Oct 19
Latitude:22°27'32.7" S
Longitude:68°39'12" W
Mass (g):11.23
Pieces:1
Class:L6
Shock stage:S2
Weathering grade:W2
Fayalite (mol%):25.59±0.50 (N=27)
Ferrosilite (mol%):21.72±0.28 (N=22)
Wollastonite (mol%):1.61±0.21 (N=22)
Classifier:V.V. Sharygin, SIGM and UrFU
Type spec mass (g):8.4
Type spec location:UrFU
Main mass:8.4 g cut-off – UrFU; 1.25 g cut-off and thin section – SIGM
Finder:UrFU meteorite expedition - Chile-2017
Comments:Submitted by Victor V. Sharygin
Institutions
   and collections
UrFU: Ural Federal University, 620002, 19 Mira street, Ekaterinburg, Russia (institutional address; updated 14 Jan 2015)
SIGM: V.S. Sobolev Institute of Geology and Mineralogy SB RAS, pr. Akademika Koptyuga, 3 Novosibirsk, 630090, Russia; Website (institutional address; updated 10 May 2017)
Catalogs:
References: Published in Meteoritical Bulletin, no. 107, in preparation (2018)
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Photos:
CreditPhotos
Public domain photographs:
Victor V. Sharygin      
Geography:

Chile
Coordinates:
     Recommended::   (22° 27' 33"S, 68° 39' 12"W)

Statistics:
     This is 1 of 1433 approved meteorites from Antofagasta, Chile (plus 5 unapproved names) (plus 1 impact crater)
     This is 1 of 1460 approved meteorites from Chile (plus 11 unapproved names) (plus 1 impact crater)
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