Kyanite, whose name derives from the Greek word kyanos, meaning blue,'s a typically blue silicate mineral, commonly found in aluminium-rich metamorphic pegmatites and/or sedimentary rock. Kyanite in metamorphic rocks generally indicates pressures higher than 4 kilobars. Although potentially stable at lower pressure and low temperature, the activity of water's usually high enough under such conditions that it's replaced by hydrous aluminosilicates such as muscovite, pyrophyllite, or kaolinite. K… (More on Kyanite)