This article is about the quartz crystal from Applied Energistics. You may be looking for the XyCraft quartz crystal.

Quartz Crystal
Grid AE Quartz Crystal
Name Quartz Crystal
Type Item
Stackable Yes (64)
Data Value 4462
Source Mod Applied Energistics

The Quartz Crystal (Later changed to Certus Quartz to differentiate from Overworld and Nether Quartz Crystals), from Applied Energistics, is dropped from a Quartz Ore block. Each ore mined drops 1-4 crystals. Quartz Crystals are used in making many ME Network machines. They can also be used to make Basic Tools, with roughly iron quality.

More information is available at the Applied Energistics' site.