4.5 gram fragment. L6
TKW 190 grams. Observed fall 24 September 2003, Tagant, Mauritania.
Gregor writes:
L6, S2, W0. I bought this fresh 4.5g fragment from R. Bartoschewitz some years ago.
Not to be confused with Boumdeid (2011), another L6 that fell in the same area 8 years later, also in September.
From the MetBul:
Petrography: (R. Bartoschewitz, Bart) Recrystallized matrix of olivine, Ca-poor pyroxene (0.1-0.5 mm) and secondary feldspar, with poorly developed barred olivine and porphyric pyroxene chondrules (~1 mm), chromite (0.1-0.5 mm), troilite, and metal.
Geochemistry: (R. Bartoschewitz, Bart; P. Appel and B. Mader, Kiel) Olivine Fa24.5-25.1; pyroxene Fs20.2-21.1Wo1.1-1.9; feldspar An10.1-15.7Or 4.9-11.0. Kamacite Ni=4.4-6.6, Co=0.7-1.3 (all in wt.%).
Radiochemistry: (D. Degering, Dresden) 22Na=0.041, 26Al=0.07 (in Bq/kg, date 2011 Nov) consistent with a 2003 fall date. |