It's another scorching hot day here so just a quick post to hold you over. This is a nice larger mineral specimen heralding all the way South from Brazil. Kyanite is its name and it gets its name from the Greek word meaning 'blue' (for obvious reasons). Though don't take it that all Kyanite is blue, like many other minerals it can have a variety of color shades. This one also comes in white, gray, green, and black, though blue is the most commonly found type. Remember that to identify minerals you can't just use the physical properties (i.e. color/shape/taste in some cases but don't go around licking rocks), you must also use the properties such as hardness, streak (the color produced when rubbed on a streak plate, it's not always the same), density, crystal lattice, and of course chemical composition. Kyanite is made up of Aluminum (Al), Silicon (Si), and Oxygen (O) with a chemical formula of Al2SiO5. It has fairly good cleavage (roughly meaning it forms sheets), has a hardness of between 4 and 7 on Moh's Scale of Hardness, a white streak, and has a fibrous habit for growing.