Sphalerite is a zinc ore and usually also contains some iron. Its name relates to the Greek word meaning 'treacherous'.
This was because it created disappointment amongst early miners, who found that it often looked similar to Galena, a lead ore, but held no lead. (I thought it was interesting that this particular Sphalerite came from Galena... but in Kansas!)
This crystal has a quite strong action within all of the chakras that are below the heart.
It is a good healing stone on many levels, but it is the role of Sphalerite to ground your nervous system that is its most beneficial characteristic.
In addition it is beneficial to keep a piece on you at times when you are having a reading done by someone else. It aids you to clearly discern when the reader is authentic, or if they are frauds and are not giving you genuine information.