|
Northwest Africa 11409 | |||||||||||||||||||||||||||||
---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
Basic information | Name: Northwest Africa 11409 This is an OFFICIAL meteorite name. Abbreviation: NWA 11409 Observed fall: No Year found: 2013 Country: Morocco Mass: 13 g | ||||||||||||||||||||||||||||
Classification history: |
This is 1 of 658 approved meteorites classified as Ureilite. [show all] Search for other: Achondrites, Ureilites | ||||||||||||||||||||||||||||
Comments: | Approved 24 Sep 2017 | ||||||||||||||||||||||||||||
Writeup |
Writeup from MB 106:
Northwest Africa 11409 (NWA 11409) Morocco Purchased: February 2013 Classification: Ureilite History: Purchased from Moroccan meteorite dealer in 2013. Physical characteristics: Physical Characteristics: Three stones exhibiting black irregular surfaces. Saw cut shows dark greenish-brown coarse grains separated by thin reflective veins. Petrography: (K. Domanik and F. Stephan, UAz) Microprobe examination of a polished mount shows approx. 80% olivine and 15% pyroxene. The average grain size of both olivine and pyroxene is approx. 1-2 mm. Numerous oxidized Fe-Ni veins 5-30 μm wide occupy grain boundaries and also crosscut some grains. The veins contain a number of large irregularly shaped lenses of graphite, partially altered to diamond, 500-1500 μm long and 30-100 μm wide. In a few cases olivine grain boundaries in contact with larger metal veins or with diamond display a thin, discontinuous, Mg-rich rim, 2-10 μm wide, containing scattered, tiny (<2um) metal blebs. Pyroxene consists entirely of a patchy, mottled mixture of pigeonite and low-Ca pyroxene containing abundant void spaces, scattered Fe-metal blebs, and small Si-rich inclusions. Geochemistry: Mineral compositions and geochemistry: (K. Domanik and F. Stephan, UAz) Olivine cores Fa21.3±1.5, Fe/Mn=46.4±6.7, Cr2O3=0.64±0.10 wt%, n=16; olivine rims Fa2.2±0.8, Fe/Mn=7.3±2.7, Cr2O3=0.42±0.14 wt%, n=11; pigeonite Fs17.2±2.3Wo7.9±0.9, Fe/Mn=24.9±4.5, Cr2O3=1.16±0.05 wt%, n=9; low-Ca pyroxene Fs13.5±0.7Wo2.7±0.4, Fe/Mn=24.7±5.7, Cr2O3=0.94±0.09 wt%, n=4. Classification: Achondrite (Ureilite) Specimens: 5.2 g plus three probe mounts on deposit at UAz, UAz holds the main mass. | ||||||||||||||||||||||||||||
Data from: MB106 Table 0 Line 0: |
|
||||||||||||||||||||||||||||
Institutions and collections |
UAz: Lunar and Planetary Laboratory, University of Arizona, 1629 E. University Blvd., Tucson, AZ 85721, United States (institutional address; updated 14 Jan 2012) |
||||||||||||||||||||||||||||
Catalogs: |
| ||||||||||||||||||||||||||||
References: | Published in Gattacceca J., Bouvier A., Grossman J., Metzler K., and Uehara M. (2019) Meteoritical Bulletin, no. 106. Meteorit. Planet. Sci. 54 in press.
| ||||||||||||||||||||||||||||
Geography: |
Statistics: This is 1 of 2049 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.
|