Raw Yellow Fluorite

Fluorite cleanses the aura. It can be used to protect against electromagnetic stress, such as those given off by mobiles or computers.
Fluorite helps in organising and processing information and is handy to keep at your work desk as it helps you learn new information and increases concentration. 
 
Yellow fluorite in particular enhances creativity.
 
These pieces also have some pyrite and dolomite formations on them.