Children of Stone: Voices in Crystal by Mary Woldering

A shepherd named Marai discovers a “fallen star”. What he finds inside changes him forever: The Children of Stone. They came from another realm in the form of crystals and gemstones, each possessing powers beyond human comprehension. The shepherd, in gratitude, undertakes a journey to the City of the King in Ancient Egypt. He will take these “Children” to the safekeeping of priests and scholars living there. A young prince learns of this. Feeling slighted, he begins a lifelong quest to control the Children of Stone or to destroy this shepherd and those he loves.