Do you have Baumann? That's where I read about it. In my memory I am vaguely picturing a simple transparent marble with bands on or near the surface. Simple bands ... not a lot of color ... but maybe there is something special about the number or arrangement of them.
I kinda vaguely remember there being a "maypole" marble already and it being different from that.
But that's what yours makes me think of. A maypole. Or a carousel.
Someone should know who all makes deep transparent blue.
I don't have a database on this ... I keep saying I want to start one based just on color attributes but then I dont' ... someone should recognize that though .... ????
Check out entry #3, Lightning Goddess. I have it on good authority that it includes some marbles.
http://piecemakermosaics.com/vote-for-your-favorites.php