Sisters of glass

"Halan is a powerless princess. She is heir to the Magi Kingdom, a blazing desert land ruled by ancient magic. But unlike every royal before her, Halan has no magical powers of her own. Nalah is a powerful pauper. The glassblower's daughter, she lives in the land of New Hadar, where magic is strictly outlawed. But Nalah has a powerful force growing within her--one she can't always control. One girl fears magic, one worships it. But when a legendary mirror connects them, Nalah and Halan finally meet--and must work together to save their two worlds, before everything they know is shattered forever"--Amazon.com.