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Northwest Africa 1834 | |||||||||||||||||||||||
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Basic information | Name: Northwest Africa 1834 This is an OFFICIAL meteorite name. Abbreviation: NWA 1834 Observed fall: No Year found: 2002 Country: (Northwest Africa) Mass: 20.2 g | ||||||||||||||||||||||
Classification history: |
This is 1 of 658 approved meteorites classified as Ureilite. [show all] Search for other: Achondrites, Ureilites | ||||||||||||||||||||||
Writeup |
Writeup from MB online:
Northwest Africa 1834 Morocco Found 2002 Achondrite (ureilite) A 20.17 g stone was purchased in Rissani, Morocco in 2003. Classification and mineralogy (J. Wittke and T. Bunch NAU): typical, medium to fine-grained (<2 mm) ureilite, non- foliated, and with only thin (0.015 mm) reduced rims on olivine and pigeonite. Interstitial metal (Ni = 2.92 wt. %; Co, 0.51 %; Si, 2.4 %) is partially oxidized. Millimeter-size graphite occurs at grain boundaries of main phases and contains silica platelets (< 3 μm) and clusters of sulfide and schreibersite. Olivine = mg# 88 with 0.87 wt % Cr2O3 and 0.57 % CaO; pigeonite = mg# 88 and contains up to 1.0 wt. % Cr2O3. Shock level, S2 and only slightly weathered. Specimens: 4.2 g at NAU; main mass, Oakes. | ||||||||||||||||||||||
Data from: MB89 Table 7 Line 23: |
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Institutions and collections |
NAU: Geology, Bldg 12
Knoles Dr
Northern Arizona University, Flagstaff, AZ 86011, United States; Website (institutional address; updated 12 Apr 2012) Oakes: Nelson Oakes, Route 1, House 50C, Uniondale, PA 18470, United States; Website (private address) |
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Catalogs: |
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References: | Published in Meteoritical Bulletin, no. 89, MAPS 40, A201-A263 (2005)
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Geography: |
Statistics: This is 1 of 9627 approved meteorites from (Northwest Africa) (plus 1865 unapproved names) | ||||||||||||||||||||||
Also see: |
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Revision history: |
This lists important revisions made to data for this record.
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