A pyrite turtle is believed to have several benefits, including:
Protection
The turtle's hard shell is said to represent protection and grounding, and can help create a safe environment. 
Shielding
Pyrite is said to have protective energies that shield the wearer from negative energies, environmental pollutants, and harmful influences. 
Abundance
Pyrite is said to be a potent stone for cultivating abundance and prosperity. It's also said to encourage wealth, success, and release negative energy and fears. 
Physical well-being
Pyrite is said to increase stamina and guard against negative energy, including negative EMF effects. It's also said to help with strong immunity, a healthy gut, a strong nervous system, and improved circulation. 
Vastu correction
A crystal tortoise is said to have the power to balance and harmonize the environment around us, and remove negative energy.