because the rainbow contains all colors, it might work well w/ all the chakras. but i think its base color might have some influence on this. so if you had rainbow sheen on black obsidian, that might start w/ your root chakra instead. the black might naturally ground the rainbow (& you). or you might need to be very cautious combining w/ rainbow quartz. if there were intense heat sensations, it'd probably hit your whole body, not just from the neck up like the teal :o ok, maybe this is why they call it the "stone of pleasure," if you get a pleasurable full-body kundalini response. but if you're prone to uncomfortable heat reactions w/ kundalini, i'd suggest using lots of grounding stones...