Full Moon Libra,
I found this in a book I have, I don't know if it's the type of info you're looking for, but hope it helps:
The quintile is an aspect of 72 degrees.
"The quintile bestows a naturally well developed capacity which is merely waiting to be brought to the surface. It is usually thought of as an intellectual aspect, being described as Mercurial in its action.
There is something very creative about it and often something occult or hidden. Not all authors agree about the way it acts. John Addey, for instance, gives it the meaning of purposefulness and points out that we often find this aspect in people of positions of power, and also in people who are striving for power."
I'm going to add here it is a minor aspect and was not much used, I am finding it increasingly used however in chart interpretation.