These aren’t technically types of agate according to Mindat, but sometimes they will be described this way in rock shops or on rockhound websites.  And these pictures are so great I couldn’t possibly pass them up.  An agate with red, orange, or yellow plumes in just the right arangement can be called a flame agate, because it looks like fire.

Photo by Vítězslav Snášel from http://www.mindat.org/photo-114774.html

Frost agate describes the cracked finish on these beads (again, it’s not a mineralogical term).  They can also be called cracked agate.  The frost effect is heightened when they are blue. Whatever they are, I would totally wear earrings made with these beads.

Photo from http://www.amazon.com/Gem-Inside-Strand-Inches-Jewelry-Making/dp/B00HTZAAL8