Pyrolusite

Pyrolusite crystallises in the formation of columns, granular masses, and reniform coatings. The colour range includes iron-black, dark steel-grey, and blue.

Pyrolusite is said to an extremely useful stone to place in your immediate environment or meditation space. 

Psychologically, Pyrolusite may promote confidence, optimism, and determination. Considered to a tenacious stone Pyrolusite, may help get to the bottom of problems and offers a means of transformation.
Emotionally, Pyrolusite is believed to have the power to change and stabilise relationships. It may help in transmuting negative exceptions into positive ones. 

Healing Pyrolusite is said to treat bronchitis, regulates the metabolism, reinforce blood vessels, and is also said to be useful for strengthening eyesight.