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| Calama 256 | |||||||||||||||||||||||||||||
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| Basic information | Name: Calama 256 This is an OFFICIAL meteorite name. Abbreviation: There is no official abbreviation for this meteorite. Observed fall: No Year found: 2022 Country: Chile Mass:  75 g | ||||||||||||||||||||||||||||
| Classification history: |
This is 1 of 660 approved meteorites classified as Ureilite. [show all] Search for other: Achondrites, Ureilites | ||||||||||||||||||||||||||||
| Comments: | Approved 29 May 2023 | ||||||||||||||||||||||||||||
| Writeup |
Writeup from MB 112:
Calama 256 22°29.58’S, 68°44.32’W Antofagasta, Chile Find: 2 May 2022 Classification: Ureilite Petrography: The rock has a coarse-grained texture formed by sub- to unhedral olivine grains of 0.5 - 1 mm in size and less abundant (~20 vol.%) pyroxene grains about 0.5 mm in size. The contacts of silicate grains at places have 120° triple junctions. Mostly all of the olivine grains are polycrystalline aggregates of fine 1-5 μm crystals. Pyroxene grains have voids and contain numerous inclusions of siliceous glass. The aggregates of graphite and diamond up to 0.6 mm in size and minor aggregates of Fe-hydroxide with relics of Fe,Ni metal occur along the contacts of olivine grains. Rare Fe,Ni metal inclusions were found in the olivine and pyroxene grains and carbon aggregates. On the contacts with carbon aggregates the olivine grains have a rims up to 100 μm width containing the fine metal iron and troilite inclusions. Geochemistry: Mineral compositions and geochemistry: Olivine is Fa 20.7 in the core to Fa8.8 in the rim, average is Fa15.5±3.9 (N=20), (in wt.%, EMP, Borisovsky S.E., IGEM RAS): CaO 0.27±0.03; Cr2O3 0.36±0.04 (N=7); Pigeonite Fs10.1±1.5Wo2.4±1.3 (N=13); Augite Fs11.8±2.1Wo10.1±7.1 (N=9) | ||||||||||||||||||||||||||||
| Data from: MB112 Table 0 Line 0: |
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| Institutions and collections |
Vernad: Vernadsky Institute of Geochemistry and Analytical Chemistry, Russia (institutional address; updated 21 Feb 2016) IGEM: Institute of Geology of Ore Deposits, Petrography, Mineralogy, and Geochemistry, Russian Academy of Sciences, Staromonetny Per., 35, Moscow, 119017 , Russia (institutional address; updated 16 Dec 2010) |
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| Catalogs: |
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| References: | Published in Meteoritical Bulletin, no. 112, in preparation (2023)
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Geography:
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Statistics: This is 1 of 3440 approved meteorites from Antofagasta, Chile (plus 12 unapproved names) (plus 1 impact crater) This is 1 of 3469 approved meteorites from Chile (plus 13 unapproved names) (plus 1 impact crater) | ||||||||||||||||||||||||||||
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| Revision history: |
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