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
Berkeley
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