Sample No.: LEW87007; 87020; 87294; 87011; 87013; 87017; 87018; 87019; 87021

Location: Lewis Cliff

Field No.: 4448; 4062; 4074; 4060; 4072; 4053; 4073; 4071; 4069

Weight (g): 3.2; 1.9; 3.9;1.0; 0.2; 1.3; 1.2; 0.5; 0.5

Dimensions (cm): 1x1.5x1; 2x1x0.5; Remainder: largest dimension <1 cm

Meteorite Type: Aubrite

Macroscopic Description: Roberta Score

The first three specimens above all appear to be paired, as do LEW87011; 87013; 87017; 87018; 87019; and 87021, which have not been thin sectioned because of their small size. They consist of large pyroxene crystals and a small number of rounded, black inclusions in a fine-grained, light-colored matrix.

Thin Section (87007,3; 87020,3; 87294,5) Description: Brian Mason

These sections are essentially identical and belong to a single meteorite. They are made up almost entirely of pyroxene clasts, up to 6 mm across, in a groundmass of comminuted pyroxene. Plagioclase is present in small amounts, along with accessory nickel-iron and sulfide. Brown limonitic haloes surround the metal grains. Most of the pyroxene is almost pure MgSiO3 (CaO 0.3-0.9%, FeO less than 0.1%); a little diopside, Wo42En58, is present. Plagioclase is almost pure albite (K2O 0.65%, CaO less than 0.1%). The meteorite is an aubrite.