Crystal Shard

Crystal Shards are a Hardmode crafting material found in the Underground Hallow, where they grow on Pearlstone Blocks, even when submerged in Water or Lava. Crystal Shards are randomly colored either pink or blue when grown or placed. They respawn randomly on Pearlstone blocks, similar to Mushrooms, making farming possible. Crystal Shards are most easily harvested using a Hammer, but can also be freed by mining the blocks surrounding them. They are easy to spot, as they are visible even in complete darkness due to a glow not unlike that of Demonite Ore.

In addition to being a common crafting material, Crystal Shards are also placeable in nearly any position (on walls, floors, and ceilings). Though they are not nearly luminous enough to replace other light sources, they can be used to mark locations or paths so as to be seen in darkness, or as decoration. Although new Crystal Shards will only spawn on Pearlstone blocks, once harvested they can be placed on any block type.

Crystal Shards have a very high sell price, higher than even Adamantite Ore, and are far more common.

Crystal Shards can be farmed by placing Pearlstone blocks in the Cavern Layer to create an artificial Underground Hallow. The area should be properly "insulated" using open areas, Clay Blocks, or Wood, three blocks wide, to prevent spreading of the Hallow.