Northwest Africa 2998 & 7262
(possibly paired stones)
2998 is an oriented stone with a nearly complete fusion crust.
credit: anonymous finder)
views of Northwest Africa 7262
credit: A. Aaronson)
section of NWA 7262. Field of view: 2.5 cm wide. Note the vesicular fusion
crust on the lower left. Click on image for enlargement (big).
credit: Randy Korotev)
samples of NWA 2998
credit: Randy Korotev)
Meteoritical Bulletin, No. 91, Meteoritics
& Planetary Science 42,
Mass: 163 g
(lunar, anorthositic breccia)
Found in the southern Algerian desert in May 2006. Purchased by A. Aaronson
in Morocco, June 2006.
characteristics: Medium brown, oriented, nearly complete
163 g stone. The fusion crust is fresh, with very prominent flow lines.
(T. Bunch and J. Wittke, NAU)
Breccia-in-breccia structure; breccia clasts are granulated or cataclastized with fine-grained to melt matrix. Vesiculated shock-melt veins and isolated glass clumps
are common. Consists of partially maskelynitized
plagioclase fragments (47 vol%), shock-melt
anorthositic clasts (38 vol%), dark glasses (7 vol%), norites and troctolites (6 vol%),
and olivine and pyroxene fragments (2 vol%). No
mare components were observed.
compositions and geochemistry: Plagioclase (An93.699;
FeO = 0.150.35 wt%), olivine (Fa21.734.6; FeO/ MnO = 7987),
orthopyroxene (Fs22.529.5Wo2.13.2; FeO/MnO =
5359), pigeonite (Fs49.3Wo5.2; FeO/MnO = 53), augite
exsolution lamellae in pigeonite (Fs27.4Wo43.1), ferroaugite (Fs45.8Wo38.9;
FeO/MnO = 28). Bulk composition: (R. Korotev, WUSL,
INAA of 224 mg sample) FeO = 2.7 wt%; Ni =60, Sm = 0.42, and Th = 0.13 (all
Achondrite (lunar, anorthositic breccia).
specimen: A total of 20.4 g and one thin section are on
deposit at NAU.
The main mass holder is anonymous.
* The purchaser says that it is from
The Meteoritical Bulletin, No. 101
Purchased: 2012 Feb
Mass: 413 g
Classification: Lunar meteorite (feldspathic breccia)
by Adam Aaronson in Temara, Morocco, in 2012
Physical characteristics: A single
stone (413 g) broken naturally into five pieces that fit together. Abundant
white clasts visible through the pale, translucent fusion crust.
Petrography: (A. Irving
and S. Kuehner, UWS; A.
Greshake, MNB). Felsic fragmental breccia
composed of feldspar-rich clasts in a very fine grained matrix. Minerals
are olivine, orthopyroxene, pigeonite, subcalcic augite, anorthite, silica,
fayalite, Ti-chromite, troilite and minor kamacite (as irregular scraps).
(Fa6.8-52.6, FeO/MnO = 72-127), orthopyroxene (Fs28.6-45.6Wo3.8-4.2,
FeO/MnO = 53-64), subcalcic augite (Fs25.4Wo34.3,
FeO/MnO = 50), augite (Fs17.1Wo41.6, FeO/MnO = 65),
plagioclase (An93.3-96.3Or0.1). Bulk composition (R. Korotev, WUSL): mean
values from INAA of subsamples are 3.1 wt.% FeO, 5.7 ppm Sc, 70 ppm Ni, 1.3
ppm La, 0.58 ppm Sm, 0.77 ppm Eu, 0.47 ppm Yb, 0.22 ppm Th.
(feldspathic breccia). This specimen is very similar in appearance, mineralogy
and bulk composition to NWA 2998, and it is likely that these are paired.
Specimens: A total of
20.3 g of material and one polished thin section are on deposit at UWB. The remaining
material is held by Aaronson.
Africa NWA 2998 and 7262 may not be terrestrially paired as the owner of
both stones believes that they were found in different places. But my
analyses of subsamples of the two stones overlap for all elements measured,
and the stones look rather similar to each other. It's one of the most feldspathic of lunar
meteorites. Together, the two stones are very similar in composition to Dar al Gani 400/1058.
2998 | 7262
K. H., Burgess R., Ruzie L, and Clay P. L. (2014)
age and regolith history of feldspathic lunar meteorites (abstract).
77th Annual Meeting of the Meteoritical Society, abstract no. 5345.
R. L and Irving A. J. (2013) Keeping up
with the lunar meteorites - 2013 (abstract). In 44th Lunar and Planetary
Science Conference, abstract no. 1216.
R. L. and Zeigler R. A. (2007) Keeping up
with the lunar meteorites (abstract). In Lunar and Planetary Science XXXVIII,
abstract no. 1340, Lunar and Planetary Institute.
R. L., Irving A. J., and Bunch T. E. (2008) Keeping up
with the lunar meteorites 2008 (abstract). In Lunar and Planetary Science
XXXIX, abstract no. 1209, 39th Lunar and Planetary Science
R. L., Jolliff B. L., and Zeigler R. A. (2010) On the origin
of the moons feldspathic highlands, pure anorthosite, and the feldspathic
lunar meteorites (abstract). In Lunar
and Planetary Science XLI, abstract no. 1440, 41st Lunar and
Planetary Science Conference.
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