Why this rock is probably not a meteorite:

The finder thought that this might be a chondritic meteorite because of the round chondrule-like objects (~1-2  mm in diameter).  Chondrules do not stand out like this on the broken surface of a chondrite, and it seems unlikely to us that they would stand out even on a highly weathered chondrite. The grayish matrix looks like it could be limestone.
What is it?

We suspect that the round things are o÷litiths - calcium carbonate growths on sand grains or organic matter, which are common in some limestones (o÷litic).  The o÷litiths may now be silicified, which would make them harder.

See also meteorwrong no. 77.

Addendum: Dr. Nicholas Gessler of UCLA saw this photo and told me that sometimes chondrules do stand out from the matrix and sent this remarkable photo of a chondrule in a CV chondrite that he has in his collection (photo by Adam and Greg Hupé).


Prepared by:

Randy L. Korotev

Department of Earth and Planetary Sciences
Washington University in St. Louis

Please don't contact me about the meteorite you think you’ve found until you read this and this.