Sample No.: RKPA80226

Location: Reckling Peak

Field No.: 1394

Weight (gms): 160.3

Meteorite Type: Iron-Octahedrite

Physical Description: Roy S. Clarke, Jr.

This dark reddish brown specimen is slightly smaller than a hen's egg and is more irregularly shaped, 4.3 cm x 3.2 cm x 2.8 cm. The top surface is covered with pits 2 to 3 mm in length, and it is uniformly and gently convex. Distribution of pits seems to have been controlled in part by the internal Widmanstätten structure. This surface, as is also the case with the bottom surface, has been strongly affected by terrestrial weathering. The bottom surface is less uniform in shape and more convex. Part of this surface has a pattern of pits similar to that on the top. However, much of this bottom surface is dominated by a pattern of parallel ridges approximately 1 mm apart standing out in relief, and expression of the internal Widmanstätten structure of the material.

Tentative Classification: Roy S. Clarke, Jr.

A microetched median slice of approximately 6 cm² was examined. A heat-altered zone surrounds the slice and is as deep a 3.5 cm in one area. A well developed Widmanstätten is present with a kamacite band width in the 1.2 mm range. The length width ratio for these lamellae is about 7. Some Neumann bands are present in the kamacite, as are rhabdites, grain boundary schreibersites and subgrain boundaries. No epsilon structure or troilite were observed. Taenite bands occupy much of the kamacite grain boundaries, and taenite-kamacite and plessite fields are present. The plessite areas are mainly pearlitic, suggesting the possibility that the specimen is heat altered. It is an octahedrite, but additional information will be required for a specific classification.