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| Calama 077 | |||||||||||||||||||||||||||||||||||||
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| 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:  175.3 g | ||||||||||||||||||||||||||||||||||||
| Classification history: |
This is 1 of 6426 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 | ||||||||||||||||||||||||||||||||||||
| Writeup |
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: |
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| Institutions and collections |
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) |
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| References: | Published in Meteoritical Bulletin, no. 109, in preparation (2020)
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Geography:
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Statistics: This is 1 of 2908 approved meteorites from Antofagasta, Chile (plus 10 unapproved names) (plus 1 impact crater) This is 1 of 2937 approved meteorites from Chile (plus 13 unapproved names) (plus 1 impact crater) | ||||||||||||||||||||||||||||||||||||
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