Scottsdale        33°42.358’N, 111°56.006’W

Arizona, United States

Find: 1 April 2017

Classification: Ordinary chondrite (LL3)

History: Mr. Todd Dziuk found an unusual looking rock at the edge of a dry wash on 1 April 2017 in a desert area of Scottsdale, Arizona. He noticed that the underside had a rusty appearance and the stone felt slightly heavier than the average rock: power sanding of a corner of the stone revealed numerous bright shiny metallic spots. Extensive searching has not revealed further meteorites.

Physical characteristics: Single 210.8 g stone with broad, shallow regmaglypts. Fusion crust well preserved - light orange stained on the surface in contact with the soil and covered with matte grey fusion crust above the ground. Interior shows tightly packed, well-defined chondrules separated by a dark matrix and scattered metal/troilite grains.

Petrography: SEM observation of a polished mount shows a wide range of chondrule types including PO, PP, BO, RP, POP, and RPT (interleaved radial pyroxene and troilite), with many olivines and pyroxenes zoned. Many chondrules show rims of troilite and more rarely by Fe-Ni metal/troilite. Large range of chondrule sizes with the largest (PO) to 6 × 4 mm, though the majority are <1 mm diameter. Opaques dominated by troilite, with sparse kamacite and high-Ni metal. Kamacite, to 500 μm, is single crystal. Many grains have well-developed curved Neumann bands. Troilite as polycrystalline grains to 500 μm, some grains with twin lamellae. The troilite rimming chondrules often has a "fizzy" texture. Native copper occurs in structurally complex grains of troilite/kamacite/tetrataenite. Scattered melt pockets to 100 microns. Weathering W1 based on minor oxidation of the metal.

Geochemistry: (L. Garvie, ASU) Olivine Fa_27.9±7.8, Fa_0.7-31.3, Cr₂O₃=0.06±0.05, range 0.01-0.3 wt%, FeO/MnO=58.3±8.6, CaO=0.12±0.11 wt%, n=29. Low Ca pyroxene Fs_15.9±10.2Wo_1.7±2.0, FeO/MnO=21.6±6.8. High Ca pyroxene has a wide range of compositions, e.g., Fs_9.5Wo_30.8, Fs_15.6Wo_41.7, Fs_20.0Wo_44.0, and Fs_22.6Wo_23.9.

Classification: LL3 ordinary chondrite, with estimated 3.6 subtype based on Fa range and Cr₂O₃ content.