Opening the Sixth Chakra
The third eye is an EXTENSION of the 6th chakra, which is located directly beneath the crown chakra, right in the middle of the brain. OPENING the 6th chakra [this is done the exact same way as with the third eye and should only be done after opening all of the other chakras], will help to activate the pineal gland and much more. See Link for opening the Third Eye The third eye mudra is unnecessary.
Because of the power of opening this chakra, I do not recommend to open it until you have opened all of your other chakras. Your third eye should also be all the way open, as it acts as a vent for the powerful energies of the sixth chakra.
I just found this recently through my own experiences in meditation. Every book I have read [plenty] focuses on the third eye, not the 6th chakra, which is directly in back of the third eye. I have found through my own experience, the 6th chakra directly ties into the pineal gland and activates it. It seems to be much more powerful than the third eye.
1. Sit with your back straight, breathe in through your nose and on the exhale vibrate “Thoth.” Release your breath slowly through your mouth and vibrate: TH-TH-TH-TH-OH-OH-OH-TH-TH-TH in one long exhale (vibrate the sound one time per exhale, as with the Yogic “humming breath”) and try to concentrate the vibration on your 6th chakra.
Now this is important. Keep the TH and OH sounding at the same time. You should be making the TH sound all throughout the exhale.
Your tongue will be vibrating between your teeth. It may take a few seconds to adjust this to where you feel it in your 6th chakra, don’t worry, just keep on going. Try to get it to the correct vibration where you can feel it in the middle of your brain. This can take some experimenting. Just do the best you can. You may have to try as many as ten to fifteen times or more to get it right.
2. Do the above 4 times in a row and then relax.
3. Now, align your sixth chakra correctly by visualizing it point end facing down as illustrated at left. The color of the sixth chakra is bluish-violet.
4. It is very important the above exercise be done for FOUR consecutive days, preferably 24 hours apart.