Why this rock is probably not a meteorite:

Because it has the composition of a manganese steel. This is a great meteorwrong. It has a coating that looks something like a meteorite fusion crust. It's composed of metal, but the concentration of nickel is too low and manganese much to high for a meteorite. Also, where the "crust" has flaked off, the texture is not like that of an iron meteorite - it's too grainy. The crust is almost certainly manganese oxide, which is black like charcoal.
What is it?

It's got to be man made.

Note added later: Carl in Tucson suggested that both this one and no. 243 were "Tombstone Manganese Silver Ore."


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.