Kyanite Silica 10mm Inner Diameter: 17cm The main effects of Kyanite Silica are "mental stability," "improved intuition and insight," and "purification and protection from negative energy." It is said to calm the mind, promote rational judgment, enhance insight and intuition, alleviate stress and anxiety, and have the power to repel negative influences from the outside. Due to being a natural stone, there may be cracks, inclusions, etc.