Seems like quartz is always placed strategically.
This is about rock piles and stone mound sites in New England. A balance is needed between keeping them secret and making them public. Also arrowheads, stone tools and other surface archaeology.
I was in a quartz hot spot just the other day: http://wakinguponturtleisland.blogspot.com/2014/12/fog-at-preachers-preserve.html
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