Heart Crystal

A  is a red heart-shaped stone that can be found underground, in the Underworld, Underground Jungle, and in Dungeons. A Heart Crystal is only harvestable with a Pickaxe, Drill or Drax. When broken, a Heart Crystal will drop one Life Crystal.

Note that Heart Crystals cannot be obtained by breaking the blocks under them, and the two blocks it is on cannot be broken until the heart is gone.

Bugs

 * If a Heart Crystal spawns on sand, then mining the sand below it will cause it to float in midair.
 * It is possible to find a Heart Crystal standing on one tile.
 * Rarely, it may appear to overlap with other objects.