Inyan

In Sioux mythology, Íŋyaŋ (Rock) was the first of the powerful spirits. He existed before the beginning of the universe. He then created Maka and gave it the spirit Makȟá-akáŋl (Earth spirit), the second of the spirit beings and a part of Íŋyaŋ. After creating Makȟá, Íŋyaŋ was very weak. He created miniature versions of Makȟá, and her lover, father sky. Those miniatures were humans. This effort made Íŋyaŋ hard and powerless. His blood became the blue waters and the sky.

Misconceptions
There are also some stories floating around out there claiming that Inyan is a good rock god, while Iya is an evil rock god. This is definitely not the case. Inyan and Iya are exactly the same name-- which literally means "Rock"-- spelled in two different Sioux orthographies (spelling systems.) Like all sacred nature spirits in Lakota and Dakota mythology, Inyan is neither good nor evil... he simply is.