Thread: Can you help my identify my stone?

This is a stone I got from a friend, it is a large 12" x 2.5" x 1" almost black, really heavy. The specific gravity is around 2.8. I was able to lap it with a diamond stone, although it took me about 30 minutes to get it right. And it was not too much of.
I took the pictures under natural light, so they are pretty much accurate.

Thanks in advance!

Daaz