Your ear is a complex organ made up of three parts: Otoconia, or ear stones, are small crystals of calcium carbonate found in two organs of your vestibular system called the saccule and utricle.

Benign paroxysmal positional vertigo (BPPV) is a type of vertigo caused by calcium crystals in the inner ear. These crystals are usually located in two parts of the ear called the utricle and saccule.