Pearlgrass

Grass or weeds that have been affected by The Hallow. What used to be normal grass is now a beautiful and pearlescent rainbowesque grass that looks a lot more like mother-of-pearl (the inside of an abalone shell) than a plant.
A sample of pearlsand was brought to the unnamed robot's Sphere, and it was left with its other supplies on top of a Grass Block. One of the Grass Blocks was converted to a Pearlgrass Block, which spread from there.