(gathered from various sources, from Argüelles in particular on the ninth & tenth)

In some methods (particularly Antero Alli's Angel Tech), the 8th chakra is cast as octaval to the first's function as, at the base of the CNS, the sense of existence, but where the first survival function is the awareness of a singular organism, the 8th chakra is awareness aware that it is everywhere-always, and that this sense can be mediated to the smaller organismal parts of mind as anywhere-anywhen-ness. Typically in diagrams the eighth chakra is portrayed directly up on the pineal-crown line four inches to a few feet above the head; however, this chakra goes anywhere direct it, sort of like a wizard's eye. If you initialize it on its own you can take it for a fly, but if you harmonize it with your other chakras you can take any of those parts of your being wherever you like.

The eighth chakra is somewhat common to find information about (probably half of chakra listings mention it), but one seldom hears about the other two chakras beyond the ones mentioned so far. These two aren't within the bounds organism's epidermis either. One of the chakras (I call it chakra zero for its position below the first on the column) exists approximately six thousand, three hundred and sixty feet below your feet: it is our Earth's core. Many methods that use the chakra system also emphasize grounding - with the Earth's core as a chakra one grounds with the ease of resting one's feet together. Teleologically this is the 9th chakra, because once one realizes one can move awareness beyond the five senses to extend the light-body, it's a reasonable leap to include the earth in your body as the second octave begins.

The 10th chakra is the bound following the leap that the earth is part of Our body: it represents our connection to the collective mind, unconscious or not (aka the noosphere). This one is between the inner and outer Van Allen radiation belts (link: http://en.wikipedia.org/wiki/Van_Allen_Radiation_Belt
), which reflect electromagnetic activity taking place on the earth's surface as well as incoming information from the Sun and other planets, and constituents of even larger systems that influence life on this planet. Become, between these belts, an eagle soaring high and seeing far and encompassing many perspectives.

Some may dispute that these are not chakras, because they are not within what we have been trained to consider our bodies. You don't have to include them in your chakra ontology if you would prefer to keep your awareness within your individuality, but even if you don't call them chakras, these represent three useful links to have in doing energy work of all kinds. Ethereal exploration is loads of fun and mobile awareness has boundless usefulness, grounding is a very useful practice, and access to the collective mind is what we need to wisen as a species.