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| Northwest Africa 14091 | |||||||||||||||||||||||||||
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| Basic information | Name: Northwest Africa 14091 This is an OFFICIAL meteorite name. Abbreviation: NWA 14091 Observed fall: No Year found: 2013 Country: Algeria Mass:  37 g | ||||||||||||||||||||||||||
| Classification history: |
This is 1 of 616 approved meteorites (plus 1 unapproved name) classified as Eucrite. [show all] Search for other: Achondrites, Eucrites, and HED achondrites | ||||||||||||||||||||||||||
| Comments: | Approved 6 Jul 2021 | ||||||||||||||||||||||||||
| Writeup |
Writeup from MB 110:
Northwest Africa 14091 (NWA 14091) Algeria Find: 2013 Dec Classification: HED achondrite (Eucrite) History: The meteorite was found near Tindouf (southwest Algeria). Physical characteristics: A single stone with fine fusion crust and some rust stains. The sawn surfaces display several clasts and clastic matrix. The sample shows fracturing and granulation resulting from the shock effects. Petrography: (R. Kared and A.Seddiki, UO-MBA, and B. Moine, UJM) The polished surface of the sample shows a brecciated texture composed of dark-gray clasts (from a few mm up to 1 cm) in a finer-grained matrix. Microscopically the sample presents four different textures with only one lithology. The first is subophitic represented by large grains of pyroxene and plagioclase. The second one is ophitic texture represented by small grains, the third one is very fine-grained texture including some large crystals and finally, the last one is fine-grained texture in which there are large grains of pyroxene. This sample contains exsolved pigeonite, plagioclase, chromite, ilmenite, silica, titanomagnetite, iron metal and apatite. Geochemistry: Mineral compositions and geochemistry: (R. Kared and A.Seddiki, UO-MBA, and B. Moine, UJM) Major and minor element chemistry of mineral phases was determined using an electron microprobe at Magmas and Volcanoes laboratory (LMV)-Clermont-Ferrand-France. Electron microprobe analyses showed pyroxene compositions of Wo5.47-28.01 En33.35-40.3Fs38.65-55.21 for pigeonite, Wo2-4.39En38.74-44.91Fs53.09-56.95 for low calcium pyroxene and Wo21.01-42.07 En32.21-36.88Fs25.71-42.55 for high calcium pyroxene. All Fe/Mn ratios lie between 25.8 and 36.44. The plagioclases are mainly bytownites An72.24-90.91Or0.25-2.8. Chromite Cr# 81.4-81.5 (100*Cr/(Cr+Al)). Oxygen isotopes: (R.C. Greenwood, OU) The oxygen isotopic composition obtained on two aliquots of this sample is δ17O = 1.807±0.008 ‰ (2σ); δ18O = 3.889±0.004 ‰ (2σ); Δ17O = -0.231±0.026 ‰ (2σ). Classification: HED achondrite (Monomict eucrite breccia). Specimens: Main mass with B. Moine, type specimen at MNHNP | ||||||||||||||||||||||||||
| Data from: MB110 Table 0 Line 0: |
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| Plots: | O isotopes: | ||||||||||||||||||||||||||
| Institutions and collections |
MNHNP: Museum National d'Histoire Naturelle, IMPMC-CP52, 57 rue Cuvier, 75005 Paris, France, France; Website (institutional address) OU: Planetary and Space Sciences Department of Physical Sciences The Open University Walton Hall Milton Keynes MK7 6AA United Kingdom, United Kingdom (institutional address; updated 8 Dec 2011) UJM: Université Jean Monnet, Saint-Etienne, France (institutional address) UO-MBA: University of Oran 2 Mohamed Ben Ahmed B.P 1015, El M'naouer, Oran, 31000, Algeria (institutional address; updated 6 Jul 2021) LMV: Laboratoire Magmas et Volcans Campus Universitaire des Cézeaux 6 Avenue Blaise Pascal TSA 60026 – CS 60026 63178 AUBIERE, France (institutional address; updated 10 Nov 2023) |
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| References: | Published in Gattacceca J., McCubbin F.M., Grossman J., Bouvier A., Chabot N.L., D'Orazio M., Goodrich C., Greshake A., Gross J., Komatsu M., Miao B., and Schrader D. (2022) The Meteoritical Bulletin, No. 110. Meteorit. Planet. Sci. 1-4
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Geography:
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Statistics: This is 1 of 1402 approved meteorites from Algeria (plus 33 unapproved names) (plus 4 impact craters) | ||||||||||||||||||||||||||