So do u have an idea
Impurities in quartz are very common... I cannot identify your 'black rock', so I suggest you take it to a gemologist who can closely examine it. Cheers, RickO
Haha Haha ha, it's more levitrite! Leave it right where you found it! Living in the gem state I have had these questions asked a million times@ "what's this"@ Always answer them the same! Haha ha!
I see a garnet crystal in there. Cold be black tourmaline. We have a lot of that around the desert near by.