|
Northwest Africa 2426 | |||||||||||||||||||||||||||||
---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
Basic information | Name: Northwest Africa 2426 This is an OFFICIAL meteorite name. Abbreviation: NWA 2426 Observed fall: No Year found: 2016 Country: (Northwest Africa) Mass: 630 g | ||||||||||||||||||||||||||||
Classification history: |
This is 1 of 54 approved meteorites classified as Eucrite-cm. [show all] Search for other: Achondrites, Eucrites, and HED achondrites | ||||||||||||||||||||||||||||
Comments: | Approved 11 May 2018 | ||||||||||||||||||||||||||||
Writeup |
Writeup from MB 107:
Northwest Africa 2426 (NWA 2426) (Northwest Africa) Purchased: 2016 Classification: HED achondrite (Eucrite, cumulate) Physical characteristics: Weathered, red caliche stain, 80% covered by glossy fusion crust showing flow lines and scales. Cut appearance: mottled gray matrix with both lighter and darker gray clasts; one large (~12 mm) clast with white feldspar and deep brown mafic silicates. Petrography: (P. Warren, UCLA) The rock is dominated by pyroxene and plagioclase. Its texture is for the most part severely brecciated and fine-grained, but scattered clasts preserve vestiges of a medium-grained (1-3 mm) equigranular igneous texture. Geochemistry: Mineral compositions and geochemistry: Low-Ca pyroxene: Fs37+/-3,Wo3.5+/-0.9 (N=35), high-Ca pyroxene: Fs15.5±2Wo43±1 (N=10). Pyroxene FeO/MnO (wt.) averages 28±3. Plagioclase: An92.5±0.8 (N=11). Scattered tiny metals have Ni at margin of EPMA detectability: very approximately 0.04 wt%, along with 0.23±0.16 wt% Co (N=10). Bulk composition results from INAA and fused-bead EPMA include Al2O3 = 12.5 wt%, Mg# = 62 mol%, Sm = 0.6 ppm. Despite obscuration of texture by brecciation, high Mg# and low REE indicate cumulate origin. Classification: Brecciated cumulate eucrite. Specimens: manifestly paired stones of 254, 232 and 144 g. | ||||||||||||||||||||||||||||
Data from: MB107 Table 0 Line 0: |
|
||||||||||||||||||||||||||||
Institutions and collections |
UCLA: Institute of Geophysics and Planetary Physics, University of California, Los Angeles, CA 90095-1567, United States (institutional address; updated 17 Oct 2011) Gessler: Nicholas Gessler, 2010 Calgary Lane, Los Angeles, CA 90077, United States (private address; updated 7 Jul 2016) |
||||||||||||||||||||||||||||
Catalogs: |
| ||||||||||||||||||||||||||||
References: | Published in Meteoritical Bulletin, no. 107, MAPS 55, 460-462
| ||||||||||||||||||||||||||||
Geography: |
Statistics: This is 1 of 9589 approved meteorites from (Northwest Africa) (plus 1869 unapproved names) | ||||||||||||||||||||||||||||
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.
|