|
Northwest Africa 7903 | |||||||||||||||||||||||||
---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
Basic information | Name: Northwest Africa 7903 This is an OFFICIAL meteorite name. Abbreviation: NWA 7903 Observed fall: No Year found: 2013 Country: Morocco Mass: 90 g | ||||||||||||||||||||||||
Classification history: |
This is 1 of 280 approved meteorites classified as Eucrite-mmict. [show all] Search for other: Achondrites, Eucrites, and HED achondrites | ||||||||||||||||||||||||
Comments: | Approved 19 Jun 2013 | ||||||||||||||||||||||||
Writeup |
Writeup from MB 102:
Northwest Africa 7903 (NWA 7903) Morocco Purchased: 2013 Classification: HED achondrite (Eucrite, monomict) History: Purchased by Adam Aaronson in 2013. Physical characteristics: Single stone, black fusion crust, saw cut reveals brecciated texture, a few cm-sized clasts and mm-sized pyroxene and plagioclase crystals set in a fine-grained, gray matrix. Petrography: (C. Agee, UNM) Microprobe examination of a polished mount shows evidence of shock with large (~1 mm), fractured, pyroxene and plagioclase grains set in a cataclastic groundmass. Most pyroxenes show exsolution lamellae. Silica-troilite domains throughout. Geochemistry: (C. Agee and L. Burkemper, UNM) Low Ca-pyroxene Fs62.2±2.2Wo4.4±2.1, Fe/Mn=32±1, n=13; high-Ca pyroxene Fs29.7±01.3Wo42.4±0.7, Fe/Mn=31±1; n=8; plagioclase Or0.6±0.1Ab12.8±2.4An86.7±2.5, n=4. Classification: Achondrite (Eucrite-mmict). Monomict based on the presence of a single compositional population of highly equilibrated low-Ca and high-Ca pyroxenes. Specimens: 19.3 g including a probe mount on deposit at UNM, Aaronson holds the main mass. | ||||||||||||||||||||||||
Data from: MB102 Table 0 Line 0: |
|
||||||||||||||||||||||||
Institutions and collections |
UNM: Institute of Meteoritics
MSC03 2050
University of New Mexico
Albuquerque NM 87131-1126
USA, United States; Website (institutional address; updated 12 Feb 2015) Aaronson: Sahara Overland Ltd., Harhora, Temara, 12000, Morocco (private address; updated 3 Jan 2010) |
||||||||||||||||||||||||
Catalogs: |
| ||||||||||||||||||||||||
References: | Published in Meteoritical Bulletin, no. 102, MAPS 50, 1662, September 2015
| ||||||||||||||||||||||||
Geography: |
Statistics: This is 1 of 2082 approved meteorites from Morocco (plus 31 unapproved names) (plus 1 impact crater) | ||||||||||||||||||||||||
Also see: |
This lists the most popular meteorites among people who looked up this meteorite.
| ||||||||||||||||||||||||
Revision history: |
This lists important revisions made to data for this record.
|