A pretty hard blue crystal with a Mohs hardness of 6-7**This crystal helps to link physical, astral and casual Bodies. With a triclinic crystal system. This stone works with the 5th Chakra.
I believe it is a stone worth having as your ally when Lucid dreaming has your answers and there is no other way to reach them. This crystal is a great ally for downloading information for questions you may have and having trouble grasping at the right solution. This crystal has a Mercurial feel to it and if details are what you are looking for just may be the perfect stone for you!
**Source: The Book of Stones by Robert Simmons and Naisha Ahsia