Black Kyanite typically forms in fans, sometimes called witches' brooms. Gem quality Kyanite is translucent and makes for very attractive cabochon jewellery, though it is difficult to cut.

Black Kyanite is believed to increase perseverance and mental stamina. This crystal is also a strong balancing agent and helps with letting go of things that are not good for you. It is an excellent crystal for attunement and meditation due to its high frequency energy. Black Kyanite is also believed to stimulate psychic abilities and help to clear confusion while increasing logical thought.