Black Kyanite is the perfect grounding stone to use before and after crystal healing, chakra clearing, or meditation. Black Kyanite promotes balance and dispels blockages. Brings tranquility and helps with communication. Helps with dream recall. Small are approximately .7 ounces and medium are approximately 1.3 ounces. Metaphysical properties are provided for your information and are not meant to replace the advice of a qualified physician or medical practitioner. Due to the nature of this product, color, size, and shape will vary.