Limonite

Limonite
Resonates with the earth, base and sacral chakras
Grounding and protecting 
A powerful intellectual facilitator, sharpening the mind and ameliorating confusion 
Defends against negative influence or psychic attack
Enhances telepathy
Facilitates standing your ground without needing to fight back
Helps protect the physical body during metaphysical activities
From Peru
 
These are priced by weight and not necessarily by size.