Sixth chakra is Adgna.

As third eye chakra, as with hypophis, are between eyebrows, as a higher on the eyebrows lines, on the forehead centre.
Colours are indigo, blue.
Stones are blue and indigo colours as Sapphire, lazurite, aquamarine, turquoise, amazonite, amethyst, belomorite, blue lace agate, blue topaz, blue calcite, pearl, blue tourmaline.