Clear quartz is like the white candle of crystals, it can take on the qualities of any stone you desire. I have tested this personally. If you are familiar with other stones/crystals all you have to do is invoke the desired stone/crystal and the properties you wish from it into the clear quartz. Let me explain why this is so.
Not only does the clear quartz contain the entire color spectrum (due to its ability to let all light pass through but it also acts as a doorway into other worlds. It is a window that can reveal whatever you wish for it to. Quartz strengthens the connection between the physical and the spiritual. It reveals to the individual utilizing it other places, times and gives access to any energy they desire. This is why it is a "psychic's" stone. It also has the ability to amplify any energy placed into it or casted through it. So I use them as wands and wards alike.
But the shape is what is most important. One sided crystal points draw energy from the base, color it with it's own energy (whatever you have charged it with) and focuses it through the point. Tumbled or rough quartz with no points holds energy and emits the energy through its aura. The larger the stone and the more energy you've charged it with determines how large the aura is and how much of it's surroundings are effected by the energy.