Applied Energistics 2
The Quartz Fiber
The quartz fiber is used to share power between networks, while keeping them separate. This allows you to power subnetworks without needing to put energy acceptors and power cables everywhere. It can also be used to keep cables from connecting, although using cables of differing colors, or using Cable Anchor is cheaper and more effective.
They are cable subparts.
Recipe
Crafting
GlassGray Stained GlassBlack Stained GlassOrange Stained GlassBlue Stained GlassBrown Stained GlassCyan Stained GlassGreen Stained GlassLight Blue Stained GlassLight Gray Stained GlassLime Stained GlassMagenta Stained GlassPink Stained GlassPurple Stained GlassRed Stained GlassTinted GlassWhite Stained GlassYellow Stained GlassCertus Quartz DustQuartz Fiber