The Meteoritical Bulletin, No. 103
DeWitt (DEW) 12007
[Collected jointly by Programma Nazionale di Ricerche in Antartide (PNRA), Italy, and Korean Expedition for Antarctic
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 icefield.
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.
(A. 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.
(M. Gemelli, M. D’Orazio,
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 (all permil).
Lunar (mingled regolithic breccia)
47.5 g endcut (type specimen) at MNA-SI,
46.7 g endcut at KOPRI.