this may make some of you pause for a second:
Zircon - Wikipedia, the free encyclopedia
one more thing: in 1932 there was a company : Brown Quartz Mining and Milling Co., Inc.- Colorado Springs, Colorado 1932
could not find much info but there you have it:
Brown Quartz Mining and Milling Co., Inc.- Colorado Springs, Colorado 1932
Brown Quartz Mine Topography, Elevation, Lat, Long,
Brown Quartz Mine (in Clear Creek County, CO)
Colorado Topo Maps | Topographic Map Data for Colorado State | Trails
enjoy...
see post: http://www.energeticforum.com/148190-post73.html
Zircon - Wikipedia, the free encyclopedia
Because of their uranium and thorium content, some zircons might undergo metamictization.
could not find much info but there you have it:
Brown Quartz Mining and Milling Co., Inc.- Colorado Springs, Colorado 1932
Brown Quartz Mine Topography, Elevation, Lat, Long,
Brown Quartz Mine (in Clear Creek County, CO)
Colorado Topo Maps | Topographic Map Data for Colorado State | Trails
enjoy...

see post: http://www.energeticforum.com/148190-post73.html
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