It is said to store, release and regulate energy, it can also be used to clear your mind and unblock energies.
The snow quartz which is milky white in colouration has a gentle feminine energy and so works slower than the clear variety.
If used during meditation quartz can help to block out distractions, maintain focus and can also harmonise chakras.
Quartz has a balancing effect on our equilibrium and so can be useful in regards to relationships, in the area of patience and clear thinking.
When used in healing it is considered to be a master healer, targeting the immune system and bringing overall balance.
There are other colours of quartz which will have additional properties to the clear variety. For example blue quartz can be used to aid the immune system and can also be used to calm the mind and help to allay fears.