|
Northwest Africa 8712 | |||||||||||||||||||||||||||
---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
Basic information | Name: Northwest Africa 8712 This is an OFFICIAL meteorite name. Abbreviation: NWA 8712 Observed fall: No Year found: 2014 Country: Morocco Mass: 455 g | ||||||||||||||||||||||||||
Classification history: |
This is 1 of 451 approved meteorites classified as Howardite. [show all] Search for other: Achondrites, HED achondrites, and Howardites | ||||||||||||||||||||||||||
Comments: | Approved 27 Mar 2015 | ||||||||||||||||||||||||||
Writeup |
Writeup from MB 104:
Northwest Africa 8712 (NWA 8712) Morocco Purchased: Feb. 2014 Classification: HED achondrite (Howardite) Petrography: The thin section shows mineral and lithic clasts (up to 4 mm in the longest dimension) of pigeonite (Fs46.1±5.2Wo10.5±3.3; n=13) and plagioclase set in a matrix of angular pyroxene (mainly orthopyroxene (Fs30.1±9.7Wo2.5±0.7; n=18) and pigeonite with a variation of Fe content) and plagioclase. Plagioclase are bytownite and anorthite. Some pigeonite grains have augite exsolution lamella. Melted clasts are observed with euhedral recrystallized olivine, pyroxene and interstitial plagioclase. Minor phases are troilite, chromite, FeNi metal and SiO2 polymorphs. Eucritic component is approximately 40 vol.%. Geochemistry: Orthopyroxene (Fs23.6-57.5Wo1.5-3.6), Fe/Mn=28.9-34; pigeonite (Fs35.7-52.4Wo5.5-16.7), Fe/Mn=27.2-32.7; augite lamella (Fs26.8-39.7Wo24.1-34.5); plagioclase (An82.8-95.9, n=12). Classification: Howardite Specimens: 20 g at PMO. | ||||||||||||||||||||||||||
Data from: MB104 Table 0 Line 0: |
|
||||||||||||||||||||||||||
Institutions and collections |
PMO: Purple Mountain Observatory, Nanjing, China (institutional address; updated 16 Dec 2011) |
||||||||||||||||||||||||||
Catalogs: |
| ||||||||||||||||||||||||||
References: | Published in Meteoritical Bulletin, no. 104, MAPS 52, 2284, Octover 2017, http://onlinelibrary.wiley.com/doi/10.1111/maps.12930/full
| ||||||||||||||||||||||||||
Geography: |
Statistics: This is 1 of 2068 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.
|