Sample No.: PCA91241

Location: Pecora Escarpment

Dimensions (cm): 4.5 x 4.0 x 1.6

Weight (g): 75.0

Meteorite Type: Ungrouped Chondrite

Macroscopic Description: Cecilia Satterwhite

Frothy, brown, and black fusion crust covers 50% of the exterior of this meteorite. The interior of PCA91241 consists of medium gray matrix. A thin discontinuous weathering rind is present as are areas of heavy oxidation. Numerous small inclusions that are white to light gray in color are visible. Evaporite deposit is present on the interior surfaces.

Thin Section (,2) Description: Brian Mason

The section shows numerous polycrystalline silicate clasts (up to 1.8 mm in maximum dimension), some small chondrules (up to 0.5 mm across), and mineral grains in a finely-granular gray matrix. A moderate amount of sulfides (both troilite and pentlandite) is present, much of it as minute grains disseminated through the matrix. No nickel-iron was seen. The meteorite appears to be unweathered. Microprobe analyses show olivine compositions with a prominent peak at Fa38, with a few more magnesian grains. The meteorite can be confidently paired with PCA91002, an ungrouped chondrite belonging to the Carlisle Lakes grouplet (Geochim. Cosmochim. Acta, v. 55, p. 2657, 1991).