sliced open, a geode sometimes contains crystals. if there are crystals or other minerals inside of the geode those properties will add to those of the geode.

colour/appearance:

edges can be brown, cream, gray, or white and it can be dyed in many other colors
they can have quartz, calcite, citrine, agate, amethyst, chalcedony and a variety of other minerals inside which would add to the properties of the stone
emotional:

helps us analyse the whole picture before making decisions

spiritual:

aids astral traveling
connects us with the higher plane and others that are of a spiritual mind as well.