Jen, since coralloid is a "catch-all term describing a variety of nodular, globular, botryoidal, or coral-like speleothems," you probably can't go wrong with calling that a coralloid. Now which morphological variety it is is another question. Knobstone? Globularite? Clusterite?
Are there more like it?
Nothing's as precious as a hole in the ground.
"Alright, who let Bonny on Cavechat? Is there a manager I can speak with?" -- that Bartlett guy