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Northwest Africa 12820 | |||||||||||||||||||||||||||||||||||
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Basic information | Name: Northwest Africa 12820 This is an OFFICIAL meteorite name. Abbreviation: NWA 12820 Observed fall: No Year found: 2019 Country: (Northwest Africa) Mass: 2.35 kg | ||||||||||||||||||||||||||||||||||
Classification history: |
This is 1 of 628 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 3 Sep 2019 | ||||||||||||||||||||||||||||||||||
Writeup |
Writeup from MB 108:
Northwest Africa 12820 (NWA 12820) (Northwest Africa) Purchased: 2019 Classification: Carbonaceous chondrite (CV3) History: A single stone weighing 2350 g was purchased in Agadir, Morocco, in March of 2019. Physical characteristics: Sample is dark-colored, has a rounded tabular and is very friable. 60% of sample is covered by an ablated fusion crust with chondrules and CAIs visible on the uncrusted surface. The cut face shows the interior is composed of reddish-orange chondrules and light-colored CAIs in a dark-grey - black matrix. Petrography: Description and Classification (A. Love, App) Sample has a chondritic texture composed of ~658 μm (avg. dia., N=38) chondrules, chondrule fragments, abundant CAIs and forsteritic amoeboid olivine aggregates, set within a fine-grained opaque matrix. Additional minerals are spinel, diopside, troilite, magnetite, rare FeNi metal and chromite. Geochemistry: (A. Love, App) Olivine: Fa3.0±2.4 (Fa0.6-9.5), N=12; low Ca pyroxene: Fs1.6±1.3Wo0.7±0.2 (Fs0.9-4.9Wo0.3-0.9), N=8. Classification: Carbonaceous chondrite (CV3). Carbonaceous chondrite, based abundance of CAIs and size of chondrules. CV3 based on unequilibrated compositions of chondrules. CV3 C-S3, moderate weathering. Specimens: Thierry Simard holds the main mass. An endcut weighing 21.22 g and a polished thin section are on deposit at App. | ||||||||||||||||||||||||||||||||||
Data from: MB108 Table 0 Line 0: |
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Institutions and collections |
App: Department of Geology, 572 Rivers St., Appalachian State University, Boone, NC 28608, United States (institutional address; updated 7 Mar 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 9589 approved meteorites from (Northwest Africa) (plus 1869 unapproved names) | ||||||||||||||||||||||||||||||||||
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Revision history: |
This lists important revisions made to data for this record.
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