Why this rock is probably not a meteorite:
All were submitted by one finder. None have fusion crusts or regmaglypts. All have the shapes of stones that were abraded and polished by water or ice.
What are they?

These stones were all found in Minnesota, so they were probably abraded and deposited by the Pleistocene glaciation. The stone in the lower right is a sandstone (layering, aligned vertically, is evident); we don't know what the whitish partial coating is. The stone in the upper right appears to be a quartzite and when struck it rings like a quartzite. It shows evidence of many collisions with other rocks. We can't identify the rock in the upper left, but it's some type of igneous or plutotonic rock.

Certainly, some meteorites that fell thousands to millions of years ago might eventually have ended up in a glacial moraine, river, or ocean where they got abraded by other rocks until they obtained shapes like this. To our knowledge, however, there are no known meteorites that have that history. Most meteorites are unstable in wet environments. They chemically weather to sand, clay, and rust before they physically weather to the shape of beach stones.     


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.