Iron, IAB complex, main group
standby for odessa photo
Found before 1922
31° 43′ N., 102° 24′ W. Over 1,000 kg of meteoritic material have been recovered in and around a small rimmed crater measuring 165 m in diameter and its associated impact holes. While the original crater, which was formed ~50,000 years ago, is thought to have measured ~180 m wide and ~30 m deep, the crater that remains today is only ~2 m deep with a rim ~2 m high.

Odessa is a coarse octahedrite assigned to the main group of the IAB complex (Wasson and Kallemeyn, 2002). Troilite–graphite–silicate aggregates are widespread in Odessa specimens, and cohenite is common. These inclusions are chondritic in nature, contain planetary rare gas elements, and were likely formed within partial melts generated through impact events that occurred very early in Solar System history at a location near 1 AU. Odessa has a very high CRE age of 875 (±70) m.y. (Voshage and Feldmann, 1979).

Information on the formation of the IAB complex silicated irons can be found on the Landes page. Pictured above are two ‘Baby Odessa’ individual fragments having a combined weight of 6.5 grams.

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