Longtian

Cengong, Guizhou, China

Found 1991 March 5

Iron (IIIAB)

According to the owner of the iron, Mr. Feng Liang, a 350 kg iron was dug from ~1 foot underground on a hilltop by villagers Deying Wu and his wife while they were reclaiming virgin soil there from February 29 - March 5, 1991. The meteorite has a cone like shape and is 70 cm long. Petrography and mineralogy (Y. Lin, IGG): Widmannstaetten structure, consisting predominantly of kamacite (6.2-7.4 wt% Ni) bands (~0.9 mm in width) with minor thin planes of taenite (<0.1 mm in width) and accessory schreibersite. The iron is structurally classified as a medium octahedrite. INAA (J. Wasson, UCLA): Ni 73.2 mg/g, Co 4.95 mg/g, Cr 153 mg/g, Ga 19.3 μg/g, As 3.29 μg/g, Ir 9.35 μg/g, Au 0.531 μg/g, hence low Au, high Ir IIIAB iron. Specimens : type specimen, 23 g, CAS ; main mass Mr Feng Liang.