This 42 mm puffy heart is cut from nice quartz and has inclusions that look to be book mica
Quartz (Clear): it is said to enhance the crystalline properties of the blood, body, and mind; activates and enhances the pineal and pituitary glands; an emotional balancer; stimulates brain functions; amplifies thought forms; its full spectrum energy activates all levels of consciousness; dispels negativity in ones energy field and environment; receives, stores, activates, transmits, and amplifies energy; a powerful healer; excellent for meditation; it is more powerful if it is double terminated; enhances interdimensional communication and communication with the Higher Self and Spirit Guides; when included with other minerals, they combine their powers; it may be included with several other minerals