Optical Microscopy of
Several stones totaling 4.2 kg were
found in the Sahara desert.
NWA3133 is an unusual meteorite. It is highly equilibrated,
as shown by the absence of chondrules and
a triple junction silicate texture. This
meteorite was initially classified as a L7 chondrite, but subsequent work revealed
isotopic similarity to CV chondrites.
Therefore, NWA3133 may represent
extensive equilibration of a
is highly weathered with alteration
features corresponding to a
weathering grade of W3 - W4. The metal
particles have been partially to
completely replaced by iron hydroxides.
Only a few relatively unaltered metal
grains are present. This surviving metal
consists of zoned taenite associated
with some kamacite. In every case, zoned
taenite exhibits a clear-etching rim and
martensite interior. No taenite cloudy
zone structure was observed.