These are Madagascar blue calcite palm stones.
Blue calcite is a stone associated with calmness, relaxation, emotional release, mental clarity, focus, gentleness, emotional healing, communication, and more. Most calcites are considered to be stones of the mind and blue stones tend to be aligned with the throat chakra. Blue calcite is specifically aligned with both the third eye and throat chakras.
Blue calcite and its beautiful sky blue coloring is very soothing to look at and inspires peaceful feelings and thoughts. It is said to engender effective, introspective and empathic communication, consideration and gentleness.
This stone is tied to the zodiac sign of Cancer, the moon, and the elements of wind and water.