Lightstone Crystals are incomplete blocks added by Tinkers' Construct. They cannot be crafted nor are they used in any crafting recipes. When placed, they do not give off any light contrary to its name. They are presently available in 3 styles that resembles Glowstone, Nether Quartz, and a crystallized Lava. Each of the three styles has 4 separate sizes with the first stage appearing to have two separate options for it.