Runestone

Runestone is a block with similar properties to stone, which is available in 7 elemental varieties and bears an assortment of glowing runes. It serves as a decorative block and building material, and is the primary block from which obelisks and shrines are constructed.

Obtaining
Runestone can be crafted from 8 stone surrounding a magic crystal of the corresponding element, or it can be collected from naturally-generated shrines and obelisks. It is also available in the wizardry tab of the creative mode inventory and via the /give command.

For each runestone type you will need the elemental crystal
Appearance
Runestone blocks appear to be made of colored stone with roughly chiseled edges. One of the six sides of each runestone block bears a random rune, which glows in the dark - though the block itself does not emit any actual light. This uses the alternate blocks feature included in vanilla Minecraft's model system, and as such, which rune shows and which direction it faces depend on where the block is placed. There are four different runes that can appear for each elemental variant. The colors of the stone and runes reflect the runestone's element.
Usage
Runestone has no uses besides construction and decoration.