Why this rock is probably not a meteorite:
This one is great. The rock on the left is a meteorite from my collection,
Gao-Guenie,
an ordinary chondrite. It has a nearly complete fusion crust. The
rock on the right was found in Indiana. It has some kind of crust
that strongly resembles a meteorite fusion crust. It can't be a desert
varnish (Indiana!). The light-colored interior is coarse grained,
with quartz, feldspar, and some dark, presumably iron-bearing mineral.
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What is it?
The Indiana rock is a granite or some closely related rock. It was
probably dropped in Indiana by a glacier. I have no idea how the
dark crust formed.
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