__Mineral:__ Oxide
__Chemistry:__ SiO2
__Color:__ Colorless
__Hardness:__ 7

One of the Gems. They work as a librarian and take part in patrol duty. They are also in charge of long-term recovery facilities located on the fourth floor. Their weapon of choice is a sickle. Lapis Lazuli was Ghost's former teammate and in charge of the library until they were taken by the Lunarians, leaving only their head; Ghost was placed in charge of the library afterwards.

Quiet and calm, Ghost is very insecure about themselves, thinking that their fallen partner, Lapis, was much better than them. Ghost speaks of Lapis in high regards, referring to them as smart and organized, and maintaining the library as if they will return soon. Because of Ghost's double structure, two personalities inhabit their body, the other being Cairngorm who's very different from Ghost. Ghost describes Cairngorm as violent and brash, but they both equally respected and followed Lapis.

||Ghost temporarily teamed up with Phos, but during their first fight, Ghost Quartz was chipped off of the underlying Cairngorm by the Lunarians and was taken to the moon, leaving only Cairngorm behind. In Ghost's final moments, it's given a clearer picture of Ghost's attitude towards Cairngorm, calling them rude, violent, selfish, and annoying. However, Ghost then entrusts Cairngorm to protect Phos after they're gone.||

(Source: Houseki no Kuni Wiki, edited)

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