Sample No.: PAT91516

Location: Patuxent Range

Dimensions (cm): See below

Weight (g): 1.6

Meteorite Type: Iron/troilite nodule

Macroscopic Description: Roy S. Clarke, Jr.

Weathered fragments were received and separated as follows: 0.7136, 0.5735, 0.2098, and 0.0562 g for a total of 1.553 g. Fragments were covered with a thin to scaly weathering crust, were nodular, and appeared to have been broken out of a larger mass along grain boundaries. The 0.57 g and 0.21 g specimens were single pieces, and the 0.06 g lot is comprised of very small grains with a few larger fragments.

Polished Section Description: Roy S. Clarke. Jr,

The 0.71 g piece approximated a slightly bent cylinder, 10 x 4 mm. An attempt was made to divide the piece along its long axis using a diamond wire saw. A single piece of 0.325 g and fragments of 0.273 g resulted. The piece was prepared as a metallographic surface of 8.6 x 4 mm. It has -12 metal regions separated mainly by sinuous troilite, and occasional metal-metal grain boundaries. Troilite is not twinned, and is occasionally bordered by schreibersite. Metal near contacts with troilite or with other metal grains is relatively free of inclusions and surrounds centers with martensite structure. Tiny precipitates of mainly schreibersite, but also some troilite and occasional kamacite, are more abundant in the interior grains. An electron microprobe traverse was made across one grain and into the martensite of a second. Ni in the clear metal was in the 23 to 30 wt% range and 23 to 18 wt% in the martensite areas. Is it possible that this nodule came from the same parent meteorite as PAT91528?