Blue Goldstone 3 1/2"Skull

Blue Goldstone 
A dark midnight blue color with flecks of copper suspended inside 
A good deflector of unwanted energies
A protection mineral
Enhances transmission of healing energy from the hands
Works well with long distance healing
Protects psychic and empathic sensitivities
 
Crystal Skulls
Help connect with spirit guides, ancestors, spiritual teachers and ascended masters
Can provide protection and healing when worked with
Can connect with ancient knowledge, as they are record keepers
Assist with channeling guidance
Can be held during meditation
You can also use them as part of a crystal grid
They each have their own personality and when asked, will give you their name
This is just a snippet of information.  There are many good books and articles to provide more information