That is not the same stuff i have been using, but if it is similar to mica powder, it does not take much of it. Depends how fine ground it is also. Going to have to play with it some.
The white (silver?) sparkle mica i have been using gets mixed 1:15 with clear and it will quickly completely cover a base cover at that mix quickly. It also makes the clear finish a little dull - not the bright shine that straight clear would have.
Lost Pole posted a good looking chartruese in the paint recipes using some i think.... i also have both a yellow and orange that i just add small amounts of the mica to and it makes it have a nice micro-glitter to the main color.