The purpose of a Quartz crystal is to amplify energy and/or to direct energy. Jane Ann Dow, in her book, Crystal Journey, explains that “the crystal, using its specific vibration, helps to create movement which can remove blocks or denser areas of energy that cause illness. The body responds to the vibration. There is the connection of energy to energy, vibration to vibration.”
Edgar Cayce says that crystals, “exercise an electromagnetic influence over physical cells, helping a body to become more effective.” In one of his channel sessions, he states that “the stone, in its vibration, is then in sympathy with the body that is also sympathetic (sensitive). The stone assists in ‘stepping up’ or ‘building up’ the sensitivity of the body.“
Crystal Habit or Configuration
A Quartz crystal habit is defined as its visible external shape. This is determined by the crystal structure, the specific crystal chemistry, and the conditions under which the crystal formed.
Quartz most often presents as a six-sided prism with a six-sided pyramid at its ends. However, not all quartz follows this pattern due to a variety of factors during the growth process, so to see a seven or eight-sided/faceted piece is not as common, but possible.

Face: The Face is the flat plane surface on the crystal also called a facet.
Main Face: The main face is most often the largest facet on the crystal which defines the “front” of the crystal. It is normally where you find these special configurations. Many (configurations) are often found to the left or right of the main face.
Base: The base of a crystal is the irregular broken end where the crystal was harvested or released itself from a larger cluster.
Striations: Multiple Ridges, furrows, scratches or linear marks, generally parallel, are normally found on the sides of a crystal caused by growth or changes in growth due to geologic agents (glaciers, streams, faulting, etc). Not all crystals have visible striations.
Termination: The place where the crystal faces/facets merge, forming a natural point or end. This is most often pointed, as shown in the example at left.
Note: In mineralogy this would be described as where the faces/facets intercept the crystallographic axis.
Doubly (Double) Terminated crystals have natural points at each end of the crystal. Energy may move outward in either direction or in both directions concurrently, which is one reason why it is sought after by healers and lightworkers. Doubly Terminated is the correct terminology, DT for short.