Red Crystal

Red Crystal is a block added by The Future Mod!.

Obtaining
Red Crystal is generated underground in the Overworld at Y levels 12 to 59 (inclusive). Up to 5 Red Crystal veins generates in 1 chunk, and each Red Crystal vein consists of up to 6 Red Crystals, making Red Crystal about as rare as Redstone Ore.

Black Crystal can also be crafted using the following recipe:

Usage
Red Crystal emits a light level of 15, making it a strong light source.

When a player looks through Red Crystal, the part of the screen that's covered by Red Crystal will be shaded red.