What causes these lines in quartz? Nature or man?

[Amber111]

Trying to learn and understand geology... thank you!

 

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[Amber111]

Found in an area where NA were known. Not saying it’s anything.... thanks

 

[IAMZIM]

Not exactly sure what you mean, but what I see is some crystal structure left over after it has been heavily fractured. Completely natural fracturing. The dark reddish stuff in the cracks is probably iron staining.

 

[smokeythecat]

That's correct, it's natural fracturing when the quartz was originally in situ.