Sizes range from 30 - 60 mm. Average length of 45mm. As with all things in nature no two are alike so actual sizes and shapes will vary. We will pick one from the lot and send it to you. Combine shipping & save on 2 or more of the same or various speicmens. A true Earthly treasure made from of the Stuff of Stars. The StarStuff.Rocks brand and certificate of authenticity indicates quality and excellence. Kyanite is typically a blue aluminosilicate mineral, usually found in aluminium-rich metamorphic pegmatites and/or sedimentary rock. Kyanite in metamorphic rocks generally indicates pressures higher than four kilobars. The crystals sizes are mostly small to medium in size with less than 5% of the deposits yielding larger specimen grade crystals. Kyanite is a very saught after stone type for jewelry making and alternative uses.Zimbabwe kyanite has a rich blue color but the gemmy clarity is variable. Other colors are known from other parts of the world, black, green and orange kyanite crystals have been reported previously.