from
The
Meteoritical Bulletin, No. 87
Dar al Gani 996
Libya
Found 1999 May 14
Lunar meteorite (fragmental breccia)
Single stone of 12.31 g found by an anonymous finder in the sand desert of
Dar al Gani. Classification and mineralogy (A. Greshake, MNB; M.
Kurz, Kurz): a fragmental breccia with lithic and mineral fragments
set into a fine-grained clastic matrix; the clast size is generally =1 mm;
mafic clasts are by far more abundant than feldspathic clasts; schlieren and
vesicles are rare. Plagioclase composition, An96.7 (range An94.3-98.3);
pigeonite, Fs19.7-51.3Wo5.5-14.1; augite, Fs24.7-38.7Wo24.7-41.7;
most Ca-pyroxenes contain pigeonite exsolution lamellae; olivine, Fa30.5
(range Fa14.2-43.2). Orthopyroxene, Fe,Ni metal, ilmenite,
Mg-Al-chromite, and troilite are present as minor phases; crystalline
fragments include intersertal impact melt rocks, dark fine-grained and
microporphyritic impact melt clasts, olivine, pyroxene and cataclastic
feldspar; no regolith component, i.e. glass spherules was found; very strong
mosaicism of plagioclase, as well as abundant melt veins and melt pockets
attest a high degree of shock; the meteorite is moderately weathered;
calcite occurs in cracks. Specimens: main mass with anonymous finder; type
specimen, 2.5 g, plus one polished thin section, MNB. |