Sample No.: LEW85369

Location: Lewis Cliff

Weight (g): 6.3

Field No.: 2013

Dimensions (cm): 1.5 x 1.5 x 0.8

Meteorite Type: Iron

Macroscopic Description: Roy S. Clarke, Jr.

This specimen is irregularly shaped, pitted, weathered, and covered with a reddish brown coating of secondary oxides.

Polished Section Description: Roy S. Clarke, Jr.

A median section through the individual provided an area of 0.8 cm² for examination. The surface comprises a number of roughly equidimensional metal grains in the 1 to 3 mm size range. Two of these grains are martensite, containing subgrains of martensite bordered by thin, irregular bands of kamacite. The kamacite grains appear to be single crystal kamacite free of inclusions. The kamacite grains react differentially to nital etchant, some becoming very dark on brief exposure. Terrestrial weathering has penetrated into the center of the sample along major kamacite/kamacite grain boundaries and along cleavages. The external surface of the slice is bordered for the most part by about 0.1 mm of terrestrial weathering products. Small areas of remnant fusion crust remain within and under the weathering products. Interior to this and around most of the exterior surface is a heat-altered zone, up to 1.5 mm thick at one point. The thickest areas of heat-altered zone are at opposite ends of the section along its long axis, suggesting that this may have been an oriented individual during atmospheric passage.