Why this rock is probably not a meteorite:

1) No fusion crust.

2) A meteorite this large would usually have regmaglypts.
What is it? Can't tell for sure from the photo.  This rock could be a meteorite that has been abraded by water and other rocks in a stream or seashore, in which case the fusion crust would be worn off. However, there's nothing about the rock, as we see it in this photo, that suggests that it is a meteorite. The fracture pattern looks like the type of columnar or polygonal jointing that is common in some slowly cooled terrestrial volcanic rocks (see also no. 13).

Examples of columnar or polygonal jointing:
Univ. of North Dakota



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.