Willcox Playa 010        32°08’54.5"N, 109°52’25.2"W

Cochise County, Arizona, United States

Found: 25 June 2006

Classification: Primitive achondrite (Lodranite)

History: The 22.3 g stone was found on the Willcox Playa by Jason Utas while hunting for meteorites with Peter Utas.

Physical characteristics: The stone resembles a triangular flattened disk and is complete and oriented stone prior to the removal of the type specimen. Weathered fusion crust is present on all sides. The trailing face retains a frothy lip of fusion crust 4-6 mm wide and 1-2 mm thick.

Petrography: (J. Utas and A. Rubin, UCLA) The stone is comprised of 0.5-1.2 mm (avg. ~0.7 mm) orthopyroxene, olivine and Ca-rich clinopyroxene grains (Fs_5.7±0.5 Wo_21.9±0.6; (n=6). Ni-poor kamacite and terrestrial oxides are also present (~25% total volume), in addition to minor amounts of troilite and Ni-bearing schreibersite. Pyroxene grains exhibit abundant crystallographically controlled exsolved Ni-poor metallic Fe. No plagioclase was observed. The stone’s composition and lack of plagioclase indicate that it is a highly reduced member of the acapuolcoite/lodranite clan. Its coarse texture and the extent of reduction indicate that it is a lodranite. The lack of plagioclase, Cr-diopside and rare Cr-bearing minerals show that the rock is not a winonaite.