Blocks of Diamonds are Vanilla decorative mineral blocks that do not appear in normally generated maps. They are obtained by crafting nine Diamonds together in a 3x3 square in a crafting grid. They use the same texture on all six sides. While only used as a decorative block and as a means of storing diamonds in a compact fashion in Vanilla Minecraft, several mods in Tekkit such as Equivalent Exchange, RailCraft and RedPower2 use this block in crafting recipes.
Energy Collector (MK1)
Antimatter Relay (MK1)
(NOTE: This must be enabled in the config to be able to craft)