For the physical body, blue quartz is good for strengthening the immune system and thyroid. It also helps with the absorption of vitamin B, iodine, iron and zinc. Blue Quartz is commonly known for its incredibly powerful abilities to increase mental clarity and improve ones organization. Blue quartz is a powerful tool for helping people to express spirituality clearly, honestly, and openly. It is also excellent for clearing out and eliminating difficult energy blockages. Blue quartz is said to promote peace and tranquility, while reducing tension, anxiety and fear.