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Northwest Africa 12752 | |||||||||||||||||||||||||||||||||||
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Basic information | Name: Northwest Africa 12752 This is an OFFICIAL meteorite name. Abbreviation: NWA 12752 Observed fall: No Year found: 2015 Country: (Northwest Africa) Mass: 550 g | ||||||||||||||||||||||||||||||||||
Classification history: |
This is 1 of 658 approved meteorites classified as Ureilite. [show all] Search for other: Achondrites, Ureilites | ||||||||||||||||||||||||||||||||||
Comments: | Approved 3 Sep 2019 | ||||||||||||||||||||||||||||||||||
Writeup |
Writeup from MB 108:
Northwest Africa 12752 (NWA 12752) (Northwest Africa) Purchased: 2015 Classification: Ureilite History: Marc Jost purchased this 550 g sample in Rissani, Morocco, in 2015. Physical characteristics: The exterior is dark brown in color and the sample has a rounded shape with a flattened side. The sample is partially coated in a weathered patina of caliche. Underneath the caliche is a flow-lined fusion crust. The fusion crust shows the sample was originally oriented. The cut face shows a crystalline interior. Petrography: Description and Classification (A. Love, App) Sample shows protogranular texture composed of 28 vol% twinned, poikilitic pigeonite (avg. length 3.4 mm) containing rounded olivine chadacrysts and 1.4 mm irregularly shaped olivine. Olivine contains reduction rims (~26.7 μm thick) showing magnesian compositions and Fe metal along grain boundaries and fractures. Up to 200 μm graphite laths present. Geochemistry: (A. Love, App) Olivine: cores Fa12.9±0.2, Fe/Mn=26.6±2.0, Cr2O3=0.7±0.0; Reduced Rims Fa9.6±1.9, Fe/Mn=18.7, Cr2O3=0.7±0.0 N=12; Pigeonite Fs11.8±0.1Wo9.6±0.0, Fe/Mn=15.4±0.4, N=10. Classification: Achondrite (Ureilite) Based on textures and mineralogy, this is a ureilite. The thickness of the reduction rims on olivine and medium hardness indicate this sample has experienced a reduction level R2. U-S3 based upon undulatory extinction and planar fractures in olivine. W3. Specimens: Marc Jost (SJS) holds the main mass. One endcut and a sliced chunk weighing 39.3 g, a polished thin section and mount 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) SJS: Space Jewels Switzerland, 2555 Brügg, Switzerland (private address; updated 3 Jan 2010) |
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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) | ||||||||||||||||||||||||||||||||||
Also see: |
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Revision history: |
This lists important revisions made to data for this record.
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