Antarctic Search for Meteorites (ANSMET) Search this
Weight:
2.51 g
Place:
Antarctica
Collection Date:
1977
Notes:
# NASA data for ALH 77155 Weathering: A/B Fracturing: A Fa: 24 mol % Fs: 20 mol % ²⁶Al: 71 ± 3 dpm/kg NTL: 25.4 ± 0.1 krad
This sample is very rough on the exterior. The knob-like surface relief features are weathered orangish-brown on their tops and commonly reveal more less-weathered (light gray) material on their sides. No fractures were noted. The patch of black fusion crust (.5x2 cm) is preserved on the B surface. The stone is 9.0x4.5x4.5 cm and is rounded on the edges. The E surface is slightly more angular than the other surfaces, possibly representing a fracture surface. When the meteorite was cleaved, a non-weathered interior was exposed. A few halos of iron-oxidation were observed around light colored inclusions. A small area of darker gray material is present close to the N side of the sample on both the E and W butt-ends.
