Clear Quartz is the Mother of all stones. It is an amplifier, recorder and storage device for intentions and communication. It is the most versatile of all crystals, amplifying the energy of other stones and creating clarity of thought and heart. Clear Quartz is also the most programmable crystal, holding an intention and directing it out into the universe. If you only have one crystal I recommend it be Clear Quartz. 

The cluster formation is additionally beneficial in that it is composed of many small points which emit energy in all directions. This cluster is from Brazil, weighs 11.75Lbs and measures 13.5"x8"x5"

The pale grey circle in the photo represents the size of a quarter.