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I did some research and found an article about Blue Quartz occurrences in Virginia in Virginia Minerals. They are confined to metamorphosed igneous intrusives of the Grenville Age. The source of the color is not conclusively explained, but either it is caused by multiple aligned micro-fractures that affect the reflectivity of light, or it is caused by the presence of Titanium. Rutile (a Titanium mineral) exists as inclusions in most of the blue quartz, but the blueness of the rock doesn't correlate with the percentage of Rutile?? I'm confused, but I guess it's no more or less beautiful whatever the explanation. I walk past it every day but today it leapt out at me, I guess because I had just seen Debby and Laurie at the Lahr Native Plant Symposium.