Lunar Meteorite: Dar al Gani 400 & 1058 (paired stones)

Dar al Gani 400 in the desert. Photo credit: anonymous finder

A sawn slice of DaG 400. The maximum dimension is ~9 cm. The rock appears to be a regolith breccia with at least one large melt-breccia clast (right of center). Photo credit: Randy Korotev

Two sides of a small slice of Dar al Gani 400. Millimeter ticks on scale. Photo credit: Randy Korotev

Two sides of another small slice of Dar al Gani 400. Millimeter ticks on scale. Photo credit: Randy Korotev

A slice of DaG 400 containing a vesicular clast of glassy impact-melt breccia (right). Photo credit: Chris Handler

Another slice of DaG 400 with a clast of some plutonic rock, probably a norite (~2 cm wide). Photo credit: Greg Hupé)

Interior of sawn-in-two DaG 1058. Scale unknown, but the rock is 1.8 kg. Photo credit: Heritage Auctions

from The Meteoritical Bulletin, No. 82

Dar al Gani 400 (DaG 400)

Libya
Found: 1998 March 10
Mass: 1425 g (1 piece)

Lunar meteorite (anorthositic breccia)

A 1.425 kg stone was found in Dar al Gani in the Libyan Sahara.

Classification and description (J. Zipfel, MPI): the meteorite is partly covered with a brownish fusion crust; fresh surfaces are gray to dark gray; matrix is well consolidated; clasts include subophitic and fine-grained to microporphyritic impact-melt breccias, granulitic fragments, intergranularly recrystallized anorthosites, and mineral fragments; chemical and O isotope composition is characteristic of lunar highland meteorites (Zipfel et al., 1998b); abundances and composition of noble gases do not suggest a pairing with DaG 262 (Scherer et al., 1998b). For further details, see Zipfel et al. (1998b). Type specimen and two polished sections are with the MPI; main mass with finder.

from The Meteoritical Bulletin, No. 101

Dar al Gani 1058 (DaG 1058)

Al Jufrah, Libya
Found: 1998 Sep 9
Mass: 1815 g (1 piece)

Lunar meteorite (feldspathic breccia)

History: A fairly large stone was found in 1998 September on the Dar al Gani plateau, Libya, near the find site of Dar al Gani 400.

Physical characteristics: Compact, fine grained gray stone (1815 g) with visible whitish to pale gray clasts and partially coated by orange-brown weathering products.

Petrography: (A. Irving and S. Kuehner, UWS) Very fine grained melt matrix breccia with larger feldspathic clasts. Minerals are anorthite, olivine, low-Ca pyroxene, more calcic pigeonite, Ti-bearing chromite, ilmenite and troilite.

Geochemistry: Olivine (Fa16.0-33.9; FeO/MnO = 90-108), low-Ca pyroxene (Fs29.8-30.3Wo4.8-6.4, FeO/MnO = 50-57), pigeonite (Fs33.7Wo10.2; Fs43.6Wo7.3; FeO/MnO = 59-61). Bulk composition (R. Korotev, WUSL): mean values from INAA of subsamples are 3.0 wt.% FeO, 5.1 ppm Sc, 80 ppm Ni, 1.4 ppm La, 0.6 ppm Sm, 0.69 ppm Eu, 0.48 ppm Yb, 0.2 ppm Th.

Classification: Lunar (feldspathic breccia). This specimen was found close to Dar al Gani 400, and similarities in mineralogy and bulk composition indicate that these are likely paired.

Specimens: A total of 25 g of type material is on deposit at UWS. The remainder is held by an anonymous collector.

Randy Says…

Compositionally, Dar al Gani 400/1058 is a typical feldspathic lunar meteorite. It is a regolith breccias dominated by clasts of impact-melt and granulitic breccias.

More Information

Meteoritical Bulletin Database

Dar al Gani 400 | 1058

References

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