Why this rock is probably not a meteorite:
The person who sent the photo of no. 73
also sent this photo, suspecting that it was of a lunar meteorite
regolith breccia. It's
probably not. Notice that there are several rounded clasts, including
the biggest
clast just above the center on the left edge. Lunar meteorites don't
have round clasts (no wind or water on the Moon). See, e.g., Dhofar
081. Also, there's one very red clast in the upper right. There
aren't any red rock types on the Moon because there is no oxidized
iron (Fe3+).
In lunar meteorite regolith breccias, the matrix is as hard as the
clasts, thus the clasts never stand out in positive (or negative)
relief on a broken surface, as on this rock.
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What is it?
A terrestrial conglomerate. Many of the clasts look like chert.
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