This is a medium palm sized blue apatite heart.

(US Imperial Ruler in pictures for scale)

Each stone and crystal has metaphysical properties that can help aid in specific situations, help boost certain body functions/body parts, and can even offer different insight into the seen and unseen world around us.

Apatite: Is a stone that can stimulate thoughts and ideas. It is used, often in conjunction with meditation, to increase intellect, imagination, and intuitive / psychic awareness. It is said to help you maintain focus, learn, concentrate, think clearly, and communicate better. It also helps repress physical hunger while opening up one to the hunger of knowledge. This stone boosts learning skills and is thought to help people learn things much faster, as well as apply them accordingly.