Colds and Flu Flourite Excellent for the common cold and flu virus. Moss Agate Good for sinus, congestion, mucus conditions, swelling of lymph nodes, post-nasal drip, lowering fevers. Blue Lace Agate Excellent for sore throats, laryngitis and tonsillitis. However, for illnesses such as tonsillitis, be sure to seek proper medical treatment such as antibiotics as no crystal will completely eliminate it. However, Blue Lace Agate can help alleviate some of the pain when held on the throat. Amethyst Used for headaches, lung and respiratory tract, insomnia and encourages re-absorption of water (to help avoid dehydration.) Aventurine Used for problems with adrenals, lungs, sinuses, heart and muscular ailments. Lapis Lazuli Treats migraines, headaches, vertigo, immune system, throat issues, insomnia. Clear Quartz Strengthens the immune system and brings balance. Also amplify the healing properties in the other stones