![]() |
||
|
Northwest Africa 10516 | |||||||||||||||||||||||||
---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
Basic information | Name: Northwest Africa 10516 This is an OFFICIAL meteorite name. Abbreviation: NWA 10516 Observed fall: No Year found: 2002 Country: (Northwest Africa) Mass: ![]() | ||||||||||||||||||||||||
Classification history: |
This is 1 of 62 approved meteorites classified as L3-6. [show all] Search for other: L chondrites, L chondrites (type 3), Ordinary chondrites, and Ordinary chondrites (type 3) | ||||||||||||||||||||||||
Comments: | Approved 27 Feb 2016 | ||||||||||||||||||||||||
Writeup![]() |
Writeup from MB 105:
Northwest Africa 10516 (NWA 10516) (Northwest Africa) Purchased: 2002 Feb Classification: Ordinary chondrite (L3-6) History: Donated to Cascadia by Edwin Thompson, who obtained the meteorite in February 2002 at the Tucson Gem and Mineral Show from a Moroccan trader. Physical characteristics: Stone with brown-red weathering patina covering both broken and curved surfaces; the latter contains remnant fusion crust. Polished cut face shows apparent breccia texture with small patches of dark, apparent shock melt and one truncated shock vein. Petrography: (A. Ruzicka and K. Farley, Cascadia) In thin section, a breccia composed of an intimate mixture of mineral and chondrule fragments with diverse (type 3-6) characteristics and some larger clasts; areas between chondrules are mainly composed of smaller chondrule and mineral fragments, although rare fine-grained matrix is present in places. BSE imaging shows that most of the rock (“host”) is composed of type 4-6 lithologies, with equilibrated olivine, and coarse plagioclase (30-150 μm long, one grain up to 460 μm long), intermixed with well-defined chondrules and fragments, some glass-bearing. Contains a 4 mm long granoblastic-textured (type 6) chondritic lithic clast. Geochemistry: (K. Farley and A. Ruzicka, Cascadia) Host dominated by equilibrated olivine (median Fa24.2, N=55) and low-Ca pyroxene (median Fs20.7, N=52) but also contains more varied olivine (Fa5.8-32.5) and low-Ca pyroxene compositions (Fs2.9-38.7). Overall average of mixture including both equilibrated and more varied compositions is olivine (Fa23.4±4.9, N=55), low-Ca pyroxene (Fs18.0±6.4Wo1.1±1.0En80.9±6.8, N=52), Ca-rich pyroxene (Fs7.2±2.6Wo42.1±4.4En50.7±7.0, N=4), plagioclase (Ab82.0±1.2Or9.0±4.3An10.9±1.6, N=7), alkali feldspar (Ab83.1±1.2Or42.9±2.0An9.6±0.9, N=3). Classification: L3-6 finely intermixed genomict breccia. Type 5-6 lithology implied by abundant equilibrated olivine and pyroxene and common coarse feldspar grain sizes; type 3 lithology implied by presence of magnesian olivine and glass in chondrules and clasts. Specimens: Cascadia holds the entire sample, consisting of 7.0 g in two pieces, a polished thin section, and a potted butt. | ||||||||||||||||||||||||
Data from: MB105 Table 0 Line 0: |
|
||||||||||||||||||||||||
Institutions and collections |
Cascadia: Cascadia Meteorite Laboratory, Portland State University, Department of Geology, Room 17 Cramer Hall, 1721 SW Broadway, Portland, OR 97201, United States; Website (institutional address; updated 28 Oct 2011) Thompson: Edwin Thompson, 5150 Dawn St., Lake Oswego, OR 97035, United States (private address) |
||||||||||||||||||||||||
Catalogs: |
| ||||||||||||||||||||||||
References: | Published in Meteoritical Bulletin, no. 105, MAPS 52, 2411, September 2017. http://onlinelibrary.wiley.com/doi/10.1111/maps.12944/full
| ||||||||||||||||||||||||
Geography: |
Statistics: This is 1 of 9429 approved meteorites from (Northwest Africa) (plus 1876 unapproved names) |