The Lueders, Texas, IAB iron meteorite with silicate inclusions

The Lueders iron meteorite with silicate inclusions was recovered as a single specimen of ∼35.4 kg in Shackelford County, Texas, in 1973 and recognized as a meteorite in 1993. Siderophile element concentrations indicate chemical classification as a low‐Ni IAB iron meteorite closely related to Landes; like Landes, it has a Cu content ∼4σ above the main IAB‐IIICD trend and therefore we also designate Lueders as an anomalous member of IAB. The metallic host is composed of equigranular kamacite but with a suggestion of octahedral structure and with a bandwidth of 1.4 mm, suggesting structural classification as a coarse octahedrite (Og). The meteorite contains ∼23 wt% of roughly millimeter to centimeter‐sized angular silicate inclusions. Classification as a IAB is confirmed by O isotopic analysis of silicate inclusions. These inclusions contain an assemblage rich in silicates, troilite and graphite; lack certain minor phases ( e.g ., daubreelite); and have angular shapes. A variety of processes ( e.g ., fragmentation, partial melting, reduction) appear to have played a significant role in the formation of Lueders and all IAB iron meteorites. Petrologic and chemical differences confirm that Lueders is not paired with the widely distributed Odessa meteorite.