The Meteoritical Bulletin, No. 103
DeWitt (DEW) 12007
[Collected jointly by Programma Nazionale di Ricerche in Antartide (PNRA),
Italy, and Korean Expedition for Antarctic Meteorites (KOREAMET)]
Find: 2013 Jan 3
Mass: 94.2 g
single unweathered stone was found on a blue ice
patch during the XXVIII PNRA expedition, 2012-2013 (in collaboration with
KOREAMET). Nine additional distinct meteorites were found in the same
characteristics: Fresh, oblate (7 × 3 × 3 cm) stone of
94.2 g. 7% of the external surface is covered by a dark brown vesicular
fusion crust. The remaining surface shows abundant mm-sized white and pale
gray clasts embedded in a dark gray fine-grained matrix.
Collareta and L. Folco,
DST-PI) Breccia consisting of numerous crystal fragments (pyroxene,
plagioclase, olivine, silica polymorphs), plagioclase-rich clasts, gabbroic
clasts, impact melt particles, rare basaltic and mingled breccia clasts.
Clasts are embedded in a very fine crystal-rich matrix, which contains
vesicular glassy veins and agglutinates. Main minerals are plagioclase,
pyroxene (pigeonite and augite), olivine, Ti-bearing chromite, Cr-bearing
ulvöspinel, ilmenite, troilite, minor silica polymorphs, baddeleyite,
tranquillityite, and tiny FeNi-metal grains.
Geochemistry: (M. Gemelli, M. D’Orazio, A.
DST-PI) Pigeonite Fs42.3±10.7Wo13.5±3.5,
Fe/Mn=63±11, n=19; augite Fs41.1±12.3Wo28.8±4.6,
Fe/Mn=66±9, n=14, plagioclase An92.1±3.6Ab7.6±3.5Or0.3±0.1,
n=13, fayalitic olivine Fa90.6±2.0, Fe/Mn=90±2, n=4, forsteritic
olivine Fa41.5±6.0, Fe/Mn=94±2, n=3. All analyses by EPMA. Bulk
Fe/Mn = 65 by HHXRF. Oxygen isotopes done by laser fluorination (A. Pack, UGött):
d18O = 6.05, d17O = 3.13, Δ17O = -0.071
Lunar (mingled regolithic breccia)
47.5 g endcut (type specimen) at MNA-SI,
46.7 g endcut at KOPRI.