Hematite helps to absorb negative energy and calms in times of stress or worry. Hematite is a very protective stone and is great to carry to help you stay grounded in many situations. Hematite is also good for working with the Root Chakra, helping to transform negative energies into a more positive vibration.

Archangel Michael is the angel of protection!
He wards off evil and protects. 
"Saint Michael the Archangel, defend us in battle. Be our protection against the wickedness and snares of the devil; May God rebuke him, we humbly pray; And do thou, O Prince of the Heavenly Host, by the power of God, thrust into hell Satan and all evil spirits who wander through the world for the ruin of souls. Amen."