These black kyanite specimens are sold individually They were mined ethically and respectfully in Brazil. They have not been heated or treated in any way. ***They are completely natural. They actually have a dark gray color, and crystallized as aggregates of blade-like crystals in intergrown "fan-like" or "spray" shapes. They are great as inexpensive specimens for mineral collections. Black Kyanite is very popular today for metaphysical use. Black Kyanite is said to stimulates psychic development on all levels, and is useful for beginners, as it also protects. ***Black Kyanite is also know to helps with dream analysis and insight, also to assists with making decisions. We have 3 sizes of hand-selected superior quality pieces available: 2 inches long, 3 inches long and 4 inches long (sizes are approximate). At MineralMiners.com your satisfaction is our top priority! We guarantee Unique Items, Superb Energy and Collector Quality at Miner's Prices! ? Have a "Gem" day!