Sawtooth Mountain        38°20’46"N, 106°57’41”W

Colorado, United States

Found: 2006

Classification: Ureilite

History: This meteorite was found by Eldon Surbeck in the summer of 2006. He was hunting for fossils on a shale exposure/talus slope when he noticed a stone that looked out of place sitting on the outcrop. He picked it up and took it home thinking that it might be a meteorite.

Physical characteristics: Single stone, oriented. Dark weathered fusion crust covered exterior with rind ~3 mm thick. A saw cut reveals dark polycrystalline texture with many thin, macroscopic, graphite grains, some up to 4 mm long.

Petrography: (C. Agee, UNM) Examination of a polished mount shows polygonal olivine and pigeonite grains (300-1000 μm) with triple junctions. Most olivines have fine Fe-metal blebs on grain boundaries and along fractures. Ubiquitous graphite, often as elongate mm-size domains. Fe-metal and oxidized metal occupying most silicate grain boundaries. Chromite is present.

Geochemistry: (C. Agee and N. Muttik, UNM) Olivine Fa_24.9±3.0, Fe/Mn=55±9, Cr₂O₃=0.46±0.01, n=15; pigeonite Fs_20.8±0.1Wo_11.8±0.1, Fe/Mn=33±2, Cr₂O₃=1.07±0.01 wt%, n=10.

Classification: Achondrite (ureilite)

Specimens: 21.8 g including a probe mount on deposit at UNM, Reed holds the main mass.