Source: This is an interesting mineral in that it occurs in metamorphic rocks in the form of the blades that you see above. These can form to be several centimeters long. The longest shown in this photograph is more than 10cm in length. The presence of these kyanite blades can tell geologists much about the pressure and temperature of the formation of the metamorphic rocks (see Colored Gemstones 101) in which it formed.
Chemical: Al2SiO5 an aluminum silicate
Crystal System: Triclinic
Formation: In long blades
Properties: Hardness of 6-7 but quite brittle and will break easily down the long direction of the crystal.
|© Copyright 2011 All Rights Reserved. Please read the fine print below:The information contained in this website is offered free of charge to anyone wishing to learn more about gemology. The information may be downloaded by any student, consumer, or jeweler for your own personal study and use. None of this site can be downloaded for posting on another website or server for any reason. It will be a violation of the copyright for anyone to copy, duplicate, distribute, and/or re-print this material in any format or any medium without written permission. Nor can anyone post this information on a for-profit website without written permission. That will ruin it for everyone and cause the entire site to be erased and canceled. Please honor this copyright for the good of everyone else.|