Antarctic Search for Meteorites (ANSMET) Search this
Place:
Antarctica
Collection Date:
1991
Notes:
# NASA data for PCA 91452 Weathering: B Fracturing: A Pairing: PCA 91328 Fs: 1-5 mol %
Smooth, brown fusion crust covers 50% of each of these three meteorite fragments. Numerous fractures penetrate the interior of PCA91328. The exposed interiors are dark brown to black and fine-grained. A few very small inclusions were noted in PCA91452 and 91467. Weathering is extensive.
The sections show a few chondrules, up to 0.3 mm across, abundant pyroxene grains (0.02-0.08 mm), and a considerable amount of nickel-iron. The meteorite is severely weathered, with limonitic staining throughout the sections. Most of the pyroxene is close to MgSiO₃ in composition, but ranges up to Fs₁₆. The metal contains less than 0.1% Si. The meteorite is classified as an ungrouped chondrite; it is essentially identical with PAT 91546 and ALH 85085 (Earth Planet. Sci. Letters, v. 91, p.1-64,1988).
