The track is so tidy that there are white quartz stones arranged along each side of the yellow quartz ballast, and where there is sand ballast it is patted down as neatly as a pie crust.
"From Edinburgh to India & Burmah"
William G. Burn Murdoch
The quartz ain't valuable enough to cover its shipping costs back to Earth.
"Eight Keys to Eden"
Mark Irvin Clifton
The quartz indicated high-grade ore; it was streaked and pitted with soft yellow gold.
"The Desert Valley"
Jackson Gregory