Today is one of my most favored and valued stones,
It comes in different colors, Blue and Black the most common, but also Green and Orange.
All Kyanites have the ability to align the entire Chakra system. They can do this with no effort from you, but if used with meditation, will also activate them up to full spin as well. Kyanite is very protective, and clears accumulated negativity. Like Selenite, it retains none and stays cleared and clean.
I use this with blue being my favored for meditation and Chakra work. Black is very grounding as well, an excellent Earth Star Chakra stone. Both are a good addition to grids to protect from psychic disruption.
There is a lot more info here:
You can see this stone has a very linear crystal form, and tends to be brilliantly reflective and forms in "blades". I will be using the blue one early today during my meditation, and carrying the black one for additional grounding today.
This is one of my "must have"recommendations for anyone who works with crystals or does "Lightwork"
Blue Kyanite Blade
Black Kyanite Blade
Both Blue and Black