Naked Science Forum
Non Life Sciences => Geology, Palaeontology & Archaeology => Topic started by: James Harville on 01/10/2016 02:45:13
-
I have attached two pictures. I am thinking somewhere between quartz, plagioclase, maybe a feldspar?
It absolutely scratches glass. I was as high up as 6000 feet on my property in Colorado. It has a dark/blue purple hue to it in some places.
Thank you!