Chalcopyrite

Chalcopyrite
A powerful energy conduit, which can remove energy blocks as well as cleaning, activating and aligning chakras
Associated with opportunity and new beginnings, and can also help attract abundance 
Assists with listening to your inner voice, bringing logical thought and accurate perception
Can aid in achieving a state of deep meditation
Grounds nervous energies, which soothes emotions
Has a positive vibration, which increases happiness, joy and believing in yourself
 
These are priced by weight and not necessarily by size.  Please note:  I used a quarter with each of these since they were all pretty big.  I just realized I didn't have these online.  I've had them for years and don't even remember where I got them from.  So, when they're gone, they're gone.