Faden quartz crystal has a fuzzy white thread-like area going side-to-side. I primarily find them in Tabby crystals, most especially Tabby clusters (two or more Tabby points attached side-to-side).
The fuzzy ‘thread’ reminds me of the white thing you sometimes find in chicken eggs when you scramble them. The energy in Faden crystals is sticky and connective like in the egg description but without the grossness factor.
Faden quartz crystal is good for astral travel (silver cord) and connecting (thread).
Faden lines in single crystals may also help you connect within a certain realm or lifetime. If it spans between more than one crystal, you may travel between more than one realm, plane or even lifetime.