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Northwest Africa 12850 | |||||||||||||||||||||||||||||||||
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Basic information | Name: Northwest Africa 12850 This is an OFFICIAL meteorite name. Abbreviation: NWA 12850 Observed fall: No Year found: 2017 Country: (Northwest Africa) Mass: ![]() | ||||||||||||||||||||||||||||||||
Classification history: |
This is 1 of 602 approved meteorites (plus 1 unapproved name) classified as CV3. [show all] Search for other: Carbonaceous chondrites, Carbonaceous chondrites (type 3), CV chondrites, and CV-CK clan chondrites | ||||||||||||||||||||||||||||||||
Comments: | Approved 29 Nov 2019 | ||||||||||||||||||||||||||||||||
Writeup![]() |
Writeup from MB 108:
Northwest Africa 12850 (NWA 12850) (Northwest Africa) Purchased: Oct 2017 Classification: Carbonaceous chondrite (CV3) History: Collected by nomads in Western Sahara and purchased by Mario Di Martino at the Torino Mineral Show in 2017 from a Moroccan dealer. Physical characteristics: A single piece weighing 42 g displaying chondrules and without fusion crust. The cut surface displays scattered CAIs. Petrography: (V. Moggi Cecchi, G. Pratesi, UniFi); In thin section a chondritic texture consisting of PO and POP chondrules ranging from 600 to 1500 μm in a fine-grained matrix is visible. PO chondrules display zoned olivine crystals. Olivine in PO and POP chondrules is markedly inhomogenesous with Mg-rich cores, while is more Fe-rich in the matrix. Orthopyroxene in chondrules is homogeneous. Iron oxides, Fe-Ni alloys and troilite are the most common opaque pohases, present as individual grains scattared in the matrix or rimming chondrules. Rounded metal aggregates are visible in some chondrules. Geochemistry: EMP (V. Moggi Cecchi, G. Pratesi, UniFi); Olivine in cores of chondrule grains (Fa1.6±0.3Fo98.4±0.3; Fe/Mn = 13.4, n=11); Olivine in matrix (Fa34.9±3.6Fo65.1±3.4; Fe/Mn = 66.6, n=15 ); Orthopyroxene in chondrule grains and matrix (Fs4.3±1.5En94.9±1.2Wo0.8±0.1, Fe/Mn = 6.5, n=10). Classification: Carbonaceous Chondrite (CV3); S1; W3 Specimens: A total of 8.6 g specimen is on deposit at MSN-FI. Di Martino holds the main mass. | ||||||||||||||||||||||||||||||||
Data from: MB108 Table 0 Line 0: |
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Institutions and collections |
MSN-FI: Museo di Storia Naturale “La Specola”, Sez. Mineralogia – Sistema Museale dell'Università degli Studi di Firenze
Via Giorgio La Pira, 4 – 50121 Firenze, Italy; Website (institutional address; updated 24 Oct 2022) UniFi: Università degli Studi di Firenze, P.zza S. Marco, 4 - 50121 Firenze, Italy (institutional address; updated 14 Sep 2013) |
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Catalogs: |
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References: | Published in Meteoritical Bulletin, no. 108 (2020) Meteorit. Planet. Sci. 55, 1146-1150
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Geography: |
Statistics: This is 1 of 8904 approved meteorites from (Northwest Africa) (plus 1871 unapproved names) |