From Halopedia, the Halo wiki
The large size of both Suban and Qikost have great effects of the tides on Sanghelios. The crystalline, raw material blamite, used in the ammunition of the Type-33 Needler and the Type-31 needle rifle, is mined from Suban. Veins of blamite are found throughout the moon's interior. Suban is the only known location of the material.
Suban is home to large Sangheili population centers, major industrial sites, and many significant armories. After the beginning of the Blooding Years, a large portion of Sanghelios' population fled to Suban, Qikost, and other Sangheili colonies for refuge. Indigenous life includes qoerith slugs.
After the start of the Created conflict, the UNSC Infinity set up a brief rendezvous on the far side of Suban with the remaining UNSC forces on the planet. Using the Pelican recovered from Genesis, they were able to reach Infinity in time.
List of appearances