So I take it it's a safe wood? lol. There was plenty of these down there... I didn't bring anything to cut with and this one happen to be loose...
I'll post some pics of the rocks I found today once they're clean as well.. They're pretty cool. There's only one I suspect would be dangerous.
I can't wait to do a malawi tank though because there's immense sandstone/limestone composite here and the stratification on it is just amazing!