It is most associated with the root chakra of the 5th dimensional human. We must ascend to similar vibrations in 5th dimensional consciousness as clear quartz. 

The rock crystal carries the light of Divine purity, the power of the universe, and its pure consciousness.

It enhances the effects of all other crystals, affecting every organ and system, and no less so the soul.

It is essential for spiritual development, it cleanses and strengthens the energetic bodies, and if we connect with its consciousness, we can read the knowledge of the universe.

It is a great help on the spiritual path, and all healers use it in their healings.

If our words are pure, our thoughts and actions are worthy of God, then we can access the consciousness of the mountain crystal.

It is impossible to list its effects, but I will try to do so in the course.