Since I had to drive to Gwinn today to purchase a rock collection, I continued south to visit the site of the weird "man-made fulgurites."
Below is the remains of the tree that knocked down the power line.
When the power line, which the home owner was told carries 14,000 volts, arced over the two to three hour period -- it created the streaks showing above ground.
All along the streaks there are fulgurite-like tubes sticking up out of the soil. These are called Lechatelierites. They are made from amorphous (non crystalline) silica quartz. Apparently, the current-conducting area around the downed power line continued to expand and glow as electrical current flowed into the ground. Not only were there rows of the fulgurites, but there were also horizontal structures that spidererd perpendicular from the main lines. Once power was finally removed, the molten materials solidified into a bubbly, glassy silica rock.
The dirt did not look all that sandy. I took a sample of the dirt and plan on getting it tested to determine its mineral content.
I acquired two boxes of little pieces. Below is one of the boxes.
I also purchased a few larger pieces.