High Island Creek        44°35.763’N, 94°01.809’W

Minnesota, United States

Find: 2011 Apr

Classification: Iron meteorite (IIIAB)

History: Plowed up in April 2011 by Bruce Lilienthal on his farm east of Arlington, Minn. Recognized immediately as "unusual" and separated from other glacial erratics. In May 2013, the Lilienthals contacted E. Calvin Alexander, Jr., at the University of Minnesota. Alexander identified the object as an iron meteorite based on its Ni content and micro-structure. Object purchased by Alexander in Feb 2014. Samples sent to Wasson for classification.

Physical characteristics: Thick, oval, highly flattened shape meteorite, 41 × 28 × 4c m. Bulk density = 7.23 g/cc. Rusty orange surface with 2-3 cm darker spots on surface. Similar shape to Arlington which was found 3.4 km to the northwest.

Petrography: Structure is Om, typical of a IIIAB. Moderate weathering near the surface.

Geochemistry: Composition: Co, 5.10 mg/g; Ni, 78.6 mg/g; Ga, 21.2 μg/g; Ge, <50 μg/g; As, 5.42 μg/g; Ir 2.25 μg/g; Au, 0.727 μg/g. The meteorite is compositionally a member of IIIAB. The only closely similar IIIAB is al-Ghanim (iron). No other iron has both a Au value within 5% and an Ir value within 10% of this composition.

Classification: Iron, IIIAB based on composition and structure.

Specimens: 1518 g at UCLA, 12077 g at UMin