Nileonite

Nileonite, more commonly known as Red Rocks, are the abundant mineral that are found everywhere across the ceilings and walls Below.

Nileonite is often found already in a pure, polished and cut form, vaguely resembling that of a diagonal Eye, or less specifically, a diamond.

Its composition, durability and value is currently unknown, though it seems to be the most abundant of materials Below, supposedly sold in a pure, ground-up form by Sketchy Joe. Though Nileonite was first revealed in Page 202 alongside the Secret Passage, it was first directly referred to in Page 205.

Upon arrival to Pinksville it is revealed that the town harbors a cheerful pink variant of Nileonite lining the ceiling of the cavern. These rocks also have the added property of ceasing the emission of their glowing light at nighttime to simulate a day and night cycle down Below, to the convenience of Pinksville's inhabitants.