Faden Quartz is different from other quartz due to a fuzzy white line running through the crystal. Faden is German for fiber and the name of these cryatls comes frmo the resemblance of the internal white line to a piece of cotton fiber. The line is usually straight and between 1mm and 1" thick. The line may be due to fractures that have broken and re-grown more than once, making the Faden line a healing line.