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Calama 077
Basic information Name: Calama 077
     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 175.3 g
Classification
  history:
Recommended:  H4    [explanation]

This is 1 of 5954 approved meteorites (plus 2 unapproved names) classified as H4.   [show all]
Search for other: H chondrites, H chondrites (type 4-7), Ordinary chondrites, and Ordinary chondrites (type 4-7)
Comments: Approved 31 Jan 2020
Writeuphelp
Writeup from MB 109:

Calama 077        22°26.569’S, 68°37.983’W

Antofagasta, Chile

Find: 2017 Oct 19

Classification: Ordinary chondrite (H4)

History: Meteorite (175.26 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.

Physical characteristics: Total mass is 175.26 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 (D. Dugushkina, RAS-UB). The meteorite consists mostly of a fine-grained inequigranular recrystallized matrix and chondrules (15%). Chondrite consists of olivine 55%, orthopyroxene 25%, clinopyroxene 7-10%, plagioclase 5%, chromite 1-2%, troilite 2-3%, kamacite and taenite 2-4%. Also chondrite contains accessory apatite. Porphyritic olivine (PO) and porphyritic olivine-pyroxene (POP) chondrules predominates. Chondrules have clear boundaries. Petrographic type is 4. Chromite-plagioclase assemblages are found in chondrite recrystallized matrix. The assemblages range in size from 50-300 µm and consist of 0.2-30-µm-size rounded, euhedral, subhedral and anhedral chromite grains surrounded by plagioclase or glass of plagioclase composition. There are grid of thin metal-troilite shock veins in fractures in olivine, pyroxene and plagioclase. Plagioclase is not melted. Shock stage is S2. Minor oxide rims around metal and troilite, minor oxide veins. Weathering grade is W1.

Geochemistry: EDX analyses by K. Dugushkina, RAS-UB. The chondrite paragenesis includes olivine Fa20±0.5 (N=23), orthopyroxene En82±0.5Fs17±0.4Wo1±0.2 (N=14), clinopyroxene En48±0.5 Fs14±1.4Wo44±0.9 (N=10), plagioclase An26±3.6 (N=9), chromite, troilite, kamacite (Ni 5.0-8.9 wt%), taenite (Ni 13.8-31.9 wt%), apatite. The average composition of chromite (N=12): Cr2O3 55.3±0.5%, TiO2 2.1±0.4%, Al2O3 6.5±0.3%, FeO 31.1±1.0%, MgO 3.7±0.7%, SiO2 0.5±0.05%, MnO 0.8±0.1%.

Classification: (K. Dugushkina, RAS-UB) H4, ordinary chondrite.

Specimens: 168.56 g 2 samples and 3.7 g cut-off and thin section UrFU

Data from:
  MB109
  Table 0
  Line 0:
State/Prov/County:Antofagasta
Origin or pseudonym:limestone deflation plain
Date:2017 Oct 19
Latitude:22°26.569'S
Longitude:68°37.983'W
Mass (g):175.26
Pieces:1
Class:H4
Shock stage:S2
Weathering grade:W1
Fayalite (mol%):20±0.5 (N=23)
Ferrosilite (mol%):17±0.4 (N=14)
Wollastonite (mol%):1±0.2 (N=14)
Classifier:K. Dugushkina, RAS-UB
Type spec mass (g):175.26
Type spec location:UrFU
Main mass:UrFU
Comments:Field name Kol-4; submitted by Kseniya Dugushkina, RAS-UB; submitted by Kseniya Dugushkina (IGG UB RAS) dugushkina.kseniya@mail.ru
Institutions
   and collections
IGG: Institute of Geology and Geophysics, Chinese Academy of Sciences, Beijing 100029, China (institutional address; updated 16 Oct 2011)
UrFU: Ural Federal University, 620002, 19 Mira street, Ekaterinburg, Russia (institutional address; updated 14 Jan 2015)
RAS-UB: Zavaritsky Institute of Geology and Geochemistry Russian Academy of Sciences, Ural Branch 15 Akademika Vonsovskogo str., Ekaterinburg, 620016, Russia (institutional address; updated 19 Apr 2018)
Catalogs:
References: Published in Meteoritical Bulletin, no. 109, in preparation (2020)
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Geography:

Chile
Coordinates:
     Recommended::   (22° 26' 34"S, 68° 37' 59"W)

Statistics:
     This is 1 of 1705 approved meteorites from Antofagasta, Chile (plus 5 unapproved names) (plus 1 impact crater)
     This is 1 of 1733 approved meteorites from Chile (plus 11 unapproved names) (plus 1 impact crater)
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