Polka Dot agate is an orbicular variety. The agate is dotted with variously colored orbs, floating in a base of agate or jasper that ranges from white to blue in color. Translucency varies from piece to piece and the dots can be black, brown, red and yellow, although an orange-brown seems to predominate in the orb department. The dots are sometimes hard edged, while some are kind of fuzzy-edged, like little floating snowballs.