When Pyrite forms, it’s often in the shape of octahedrons, cubes, or pyritohedrons, which usually have striated faces

Metaphysical properties of pyrite include its ability to promote psychic development, improve memory, practicality, optimism, and strength of will. 

It is also said to open the channels between the left and right hemispheres of the brain. This would allow us to unfold and use our unique talents.

Pyrite will help you reset the brain so that you will have new ways of thinking. Old ways of thinking will produce the same results, so this stone will encourage you to get rid of the old. 

http://www.skylineminerals.com/Pyrite.html

https://meanings.crystalsandjewelry.com/pyrite/