Definitions for "Botryoidal"
Having the form of a bunch of grapes; like a cluster of grapes, as a mineral presenting an aggregation of small spherical or spheroidal prominences; as, botryoidal hematite.
resembling a cluster of grapes in form
A bumpy, grape-like formation, examples are hematite or malachite.
chalcedony forms bubbly surface found in the geodes of Kentucky & Indiana