"Running through every layer of the Earth, intertwined with the core itself, are glowing veins of Loralite. The energy is thin in some places, stronger in others, but there's nowhere on the planet that isn't close to its gentle glow." -Ella, The Fate of Ten
Loralite is a special mineral from Lorien, found only at its core. Loralite can also come in a liquid form, as seen with Number Seven's vial of liquid Loralite in her Loric Chest. All of Loralite's capabilities are unknown, but it is said and shown in the books that Number Eight can use his Legacy of Teleportation to teleport to any of the many Loralite's worldwide locations at random.
The energy in the Legacy of Energy Blasts is described in The Fallen Legacies to also be a cobalt color, meaning that the Legacy and Loralite could have a connection.
While the original six stones seem to be large boulders placed deliberately in certain locations, the new ones, apparently numbering at "fifty-odd," appear to have erected from the ground as outcroppings of the mineral.