Red Dry Lake 067 (RdDL 067)        35°39.521’N, 114°1.544’W

Mohave, AZ, USA

Found: 3 March 2009

Classification: Ordinary chondrite (L3.4)

History: A single, black, fusion-crusted stone was found by Paul Desilets on March 3, 2009, on Red Dry Lake, Arizona.

Physical characteristics: The 6.2-g stone displays dull, moderately weathered black fusion crust. Several large chondrules protrude from the stone. The interior of the stone is gray with minor iron-oxide staining.

Petrography: (Laurence Garvie, ASU) The section shows a close-packed aggregate of chondrules and chondrule fragments to 2.2 mm. The matrix is dark with minor metal and troilite, which is sometimes concentrated at chondrule rims. Chondrules are dominated by granular, PO, POP, poikilitic pyroxene, and PP, with subordinate amounts of RP and BO. In addition, the section contains two 500 μm well-developed, purple (in PP transmitted light) glass chondrules, several chondrules with bleached rims, and a 500 μm metal-sulfide chondrule.

Geochemistry: (Laurence Garvie, ASU) Microprobe analyses show olivine and pyroxene of variable compositions. Olivines Fa_0.3-42.1, with a mean of 23.9 mol% (n=33). Cr₂O₃ shows a bimodal distribution with maxima at 0.02 and 0.08 wt%. Pyroxene Fs_1.3-31.4 and Wo_0.2-5.0. One PP chondrule contains small augite grains Fs_20.95Wo_30.05. Oxygen isotopes: (R. Tanaka and D. Rumble, Okayama University at Misasa), (mean of two replicates: δ¹⁷O = 3.77‰; δ¹⁸O = 5.48‰; Δ¹⁷O = 0.88‰).

Classification: Ordinary chondrite, L3.4

Specimens: ASU holds 2.281 g (in three pieces), two thin sections and one polished stub.