Crystal contains information about the Mystcraft mod.
Crystals are a type of collectable material found in and around water. Crystals only form in ages with the Crystals symbol.
Crystals appear as a jagged formation of blue, pockmarked blocks -- the same texture as End Stone but with a blue tint. When harvested with any tool, they drop a single block of solid crystal that can be used for decoration, shaping Portals, or crafting a Book Receptacle to open Portals.