I believe that clear quartz is a must for all crystal collectors. It has vast metaphysical purposed from helping to expand consciousness to helping open communication and stimulate the chakras. Clear quartz helps to eliminate energy blockages which in turn allows energy to flow more smooth.
Clear quartz is the most powerful healing stone. It is known as the stone of power and it amplifies energy and intentions, like many stones it helps to protect the user against negativity and helps to attune you to your higher self.
Clear quartz symbolizes spiritual healing. Please see below for informative video
video courtesy of www.sungoddessashley.com