What are Ancient Minerals Magnesium Bath Flakes? Ancient Minerals magnesium flakes are dry flakes of magnesium chloride hexadyrate and other trace minerals, in a convenient and economical form for utilization in baths and foot soaks. Ancient Minerals magnesium flakes are approximately 47% magnesium chloride by weight. Where Do Ancient Minerals Magnesium Bath Flakes Come From? Ancient Minerals magnesium …