These calcite crystals belong in a category all their own, simply because they represent the hundreds of ways calcite can crystallize. There is no other mineral type that can do this.
Calcite crystals can be viewed as the bones of the Mother. This crystal is the central structure of the mineral kingdom, and can be seen as the base from which many other minerals are formed. It has a very feminine vibration and is a great facilitator of healing on all levels.
The use of this mineral in sacred space can facilitate altered states of consciousness, shape-shifting, and time travel (or awareness of multidimensional space).
In addition to all of this, these calcite crystals are a beautiful addition to any space.