Lightbrick

Lightbrick is, despite the name, a natural occurring rock found in certain areas of Thivis. Lightbricks are named after the fact that when broken, they fall apart into square cubes of varying sizes, no matter how exactly the force is applied to them.

Lightbricks are very light and quite fragile. They have a smooth surface and are cool to the touch. If left in the daylight for about 12 hours, a ten-by-ten cm cube will absorb enough light to glow for hours.

Lightbricks are usually white, but there are places where one can find coloured stones.