Kyanite is a mineral that stands out for its peculiarity: it has different hardness on its edges.
Therefore, it can be both brittle and hard.
Composition (formula): Al2OSiO4, possible admixture of iron, chromium
Color: Blue of different shades, gray, white, green, dark gray. Also light blue, yellowish, pinkish, red-brown, colorless
Stroke color: White
Hardness: 4.5-7.5
Syngony: Triclinic
Esoterics: from the series Minerals of tasks.
Improves memory, grants a thirst for knowledge, makes its owner reasonable and prudent, frees from false illusions.
The owner of such a mineral will always be able to soberly assess the situation and not succumb to empty illusions. It will help to concentrate on one thing and not to scatter forces. It will help to choose the right thing to do. The thing of your soul.