There's different opinions about clear quartz crystal depending on which crystal healer you ask.
But it's my opinion that
it will work on every chakra, because
if you think about a crystal prism,
you hold them up to the sunlight and they diffract the light
into all seven of the colored rays. And so it's
my feeling that quartz
crystal acts very much the same way
and by bringing a clear quartz crystal into your energy field, it will work to balance and
align
and heal all seven of the chakras. Other healers, however,
find that quartz crystal should only
be used in
specific instances and for particular types of
healing. And they're almost used like
surgical instruments. They're brought in for 
things like psychic surgery,
or to
open the chakras
by pointing the termination, or the point of the crystal, toward a chakra and
rotating it in small, clockwise circles about
an inch or two from the chakra - that that will actually help open that chakra. And I do
believe that they can be used in that way also,
but I feel just by bringing them into our energy field,
what happens is
the body goes through the process of
entrainment. So
the body, our human body - think of all the stresses you go through
in your day or all the things that happened where
you felt a little bit unbalanced.
You don't feel like your whole, healthy, perfect self.
Well by bringing a crystal, especially a quartz crystal, into your energetic field, your body will start to mimic
the perfect harmony and balance in that crystal.
Because each crystal is a
complete molecular blueprint
based on the atoms and molecules
that form that stone.
So by bringing that
perfect harmony into our energy field,
our body will begin to mimic it so we can start
our healing. There's lots of healing we can do
on our own, but if you have the
tools there to help you on your
journey,
of course just use them. I mean, why not? It 
makes it so much more rewarding and fulfilling
and it really does help
that healing process happen faster. And in a way, that sometimes even though it's
quicker, it's also more subtle, so you avoid things changing too quickly in your energy
field and you avoid any discomfort.
Sometimes we're so used to being
stuck in unhealthy patterns that when we do start on the healing process and we're
changing our energy, it can be
uncomfortable because it's different
and it's new. So by bringing crystals into the energy field, it gives our body
an idea of where it's supposed to be at, what it's supposed to be vibrating like, how that energy's
supposed to be flowing. And so crystals really can be very beneficial for healing
simply by having them in your
environment. You don't necessarily
have to have them on your body. It could just be a large crystal cluster placed in
your living room.
Something to contemplate, something to 
meditate by. Crystals really do just act as a
center of focus, to help us get to that place where we can become whole, healthy beings.
