Can someone identify this rock for me?

[EMIN3M]

 

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[Eu_citzen]

Something related to quartz is quite likely, can't say much for sure though.
Can a knife scratch it?

 

[GatorBoy]

Where did you find it. it is either naturally river tumbled. or through the use of machinery produced the same affect. most of that is a form of quartsite sold as river rock by the bag.

 

[StoneWhisper]

Looks like Quartz with small strands of tourmaline.. (black Areas)