The white howlite stone is believed to help teach patience, and overcome self criticism. It is also a very calming stone used to relieve stress of all kinds. It makes an excellent antidote to insomnia due to an overactive mind.
Zodiac - Gemini
Element - Air
 
Agate stone is known to rebalance and harmonize the body, mind and spirit. It is also known to cleanse and stabilize the aura, banishing negativity. Agate is believed to stimulate and strengthen our analytical capabilities, encouraging us to think clearly and concentrate upon the task at hand. It’s also believed that the stone allows us to gain inspiration from spiritual worlds.
Chakra - Crown Chakra
Zodiac - Gemini, Virgo
Element - Earth