Buck Mountains 005 (BM 005)        34°42.202’N, 114°11.458’W

Arizona, United States

Found: 2007 Oct 9

Classification: Ordinary chondrite (L6)

History: All pieces were found on the same day in a 1.3 × 1.3 m area by Dennis Asher, who donated one specimen to Cascadia on July 7, 2009, and another small fragment on June 14, 2010.

Physical characteristics: The specimens have broken surfaces covered by a weathering patina that varies from light brown to dark brown, and portions with a smooth fusion crust covered by the same patina. The smaller fragment has a distinctive ridge.

Petrography: (A. Ruzicka and M. Hutson, Cascadia) Texture dominantly granoblastic. Indistinct chondrules visible. Feldspar grains are commonly >50 µm and sometimes >100 µm across, consistent with petrologic type 6. Somewhat less than 50% of the metal is replaced by weathering products. The ridge in the smaller fragment is the surface expression of a 5-mm-wide glassy vein that has a zoned structure, with a well-defined central core that contains clasts.

Geochemistry: Olivine Fa_25.0±0.5, n=61; low-Ca pyroxene Fs_20.7±0.6Wo_1.6±0.2, n=6.

Classification: Ordinary chondrite (L6), contains incipient metal veins and one thick glassy vein..

Specimens: 77 g, two polished thin sections, and two butts are on deposit at Cascadia. The finder holds the main mass.