Abstract
Abstract Al‐Jimshan is a highly weathered 11.45 kg chondrite that was found in 1955 in the Rub' al Khali Desert, Saudi Arabia (20*42′N, 52*50E) about 240 km south‐east of the town of al‐Hadidah. The main mass is now at UCLA. Based on texture and mineral composition (olivine Fa17.7 ± 0.4; pyroxene Fs15.7 ± 1.0 Wo13 ± 0.4), al‐Jimshan is classified as an H4 chondrite of shock stage S2. The Bir‐Hadi and ad‐Dahbubah H chondrites, which also were found in the Rub'al Khali (Holm, 1962), are probably not paired with al‐Jimshan. They are classified as H5, shock stage S3 (Fa18.1 ± 0.5, n = 10; Fs16.0 ± 0.6, Wo1.1 ± 0.4, n = 9) and H5, shock stage S2 (Fa17.9 ± 0.3, n = 10; FS15.5 ± 0.2 Wo1.0 ± 0.4, n = 10), respectively.
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