Agate is protective, healing and stabilizing. It comes in many colors and varieties, some of those colors represent other properties such as blue lace agate, moss agate and carnelian. So depending on which kind of agate you are using, you may want to check those descriptions as well. All agate do have similarities in which they are all strengthening and grounding. Agate can also help you connect further with the earth. Agate is said to cure insomnia if you place it under your pillow as you sleep, it also works to relieve stress and raise energy. Agate can help to ground and stabilize emotions therefore it is helpful for agate to one that feels unstable in the emotional department.
From the metaphysical point of view, geodes are wonderful for family harmony and the home. They are good for stimulating creativity and harmony. Large geodes placed in home corners help to stimulate chi flow in that area. Placing a crystal inside a geode helps to cleanse and recharge it at the same time; think of geodes as power generators comprising the sum total of ALL the little crystals it contains! On another level, geodes actually represent the divine feminine aspect. The cavity within the geode may be taken to symbolize the womb.
These qualities are in addition to the individual properties of the crystals on the lining surface, as well as the mineral comprising the banding beneath. This means an amethyst geode, for example, will exhibit the amplified metaphysical properties of its amethyst crystals as well as the properties of the agate underlying them. Placing a small amethyst geode near your bedside table may well be the sleep panacea you have been searching for.