Honored as the birthstone of February, amethyst is a type of quartz like several of the other crystals on this list. It’s mostly recognized for its ability to instill people with a sense of calm and tranquility that lends to improved clarity, most often noticeable in times of chaos and confusion. If you’re feeling frazzled, amethyst can help you find your hidden confidence. Looking to kick a bad habit? This crystal, noted for its spectrum of majestic purple shades, can give you the strength to break those negative loops and cast away those spiritual crutches once and for all. It also makes a worthy shield against stress and negativity, helping you regain a grateful balance.