Purple argillite. Among the oldest sedimentary stones on the planet, estimated to be between 500 million years old and possibly billions. 
Discussion
Looks like a dino fossil tooth. ๐ฆ
I have a Dino vertebrae! Want to see it? ๐๐คฃ
#YESTR
This is one of the coolest things I have ever found. (No veelog, sorry. ๐
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Vertebralog LFG