Why this rock is probably not a meteorite:

The photo shows the sawn face of a mostly metal "rock." The photo was taken about 10 minutes after the cut was made (with a ring of keys on the left for scale). The metal has already begun to rust.

1) No fusion crust

2) The stony parts at the bottom and right side appear to consist in part of quartz sand held together by rust or hematite. Meteorites don't contain quartz.

3) The metal chunk is very much bigger than the flecks of metal that are found in the most common kind of meteorite, ordinary chondrites.

4) There's vesicular (bubbly) glass near the metal. Meteorites don't contain vesicular glass on the inside.

5) The nickel concentration of the metal is <1%. Metal in meteorites is typically 5-30% nickel.
What is it?

Probably a piece of slag.


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.